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My Flutter App is Crashing on several devices after launching on playstore

I have launched an app on play store but it is crashing on several devices & I am not able test my app on every devices.
i have crashlytics report
Crashlytics Report
Stack Trace
I am getting this error in android version 6
Fatal Exception: java.lang.NoClassDefFoundError: Failed resolution of: Ld/e/c/a/c;
at com.google.common.base.Splitter.on(Splitter.java)
at io.grpc.internal.GrpcUtil.<clinit>(GrpcUtil.java)
at io.grpc.internal.AbstractManagedChannelImplBuilder.<clinit>(AbstractManagedChannelImplBuilder.java)
at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java)
at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java)
at io.grpc.ManagedChannelBuilder.forTarget(ManagedChannelBuilder.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.initChannel(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.lambda$initChannelTask$6(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.lambda$initChannelTask$6$GrpcCallProvider(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.-$$Lambda$GrpcCallProvider$SCD5iiibQ8l4haiO8ofSfE0wIJg.call(-.java)
at com.google.android.gms.tasks.zzv.run(zzv.java)
at com.google.firebase.firestore.util.ThrottledForwardingExecutor.lambda$execute$0(ThrottledForwardingExecutor.java)
at com.google.firebase.firestore.util.ThrottledForwardingExecutor.lambda$execute$0$ThrottledForwardingExecutor(ThrottledForwardingExecutor.java)
at com.google.firebase.firestore.util.-$$Lambda$ThrottledForwardingExecutor$MfIJbVuxZtLwosAgPzPA-cU66Ko.run(-.java)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Caused by java.lang.ClassNotFoundException: Didn't find class "d.e.c.a.c" on path: DexPathList[[zip file "/data/app/com.scaptor.bkdschool-1/base.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.armeabi_v7a.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.bn.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.en.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.gu.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.hi.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.kn.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.mr.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.ta.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.te.apk", zip file "/data/app/com.scaptor.bkdschool-1/split_config.xhdpi.apk"],nativeLibraryDirectories=[/data/app/com.scaptor.bkdschool-1/lib/arm, /data/app/com.scaptor.bkdschool-1/base.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.armeabi_v7a.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.bn.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.en.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.gu.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.hi.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.kn.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.mr.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.ta.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.te.apk!/lib/armeabi-v7a, /data/app/com.scaptor.bkdschool-1/split_config.xhdpi.apk!/lib/armeabi-v7a, /vendor/lib, /system/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
at com.google.common.base.Splitter.on(Splitter.java)
at io.grpc.internal.GrpcUtil.<clinit>(GrpcUtil.java)
at io.grpc.internal.AbstractManagedChannelImplBuilder.<clinit>(AbstractManagedChannelImplBuilder.java)
at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java)
at io.grpc.okhttp.OkHttpChannelProvider.builderForTarget(OkHttpChannelProvider.java)
at io.grpc.ManagedChannelBuilder.forTarget(ManagedChannelBuilder.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.initChannel(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.lambda$initChannelTask$6(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.GrpcCallProvider.lambda$initChannelTask$6$GrpcCallProvider(GrpcCallProvider.java)
at com.google.firebase.firestore.remote.-$$Lambda$GrpcCallProvider$SCD5iiibQ8l4haiO8ofSfE0wIJg.call(-.java)
at com.google.android.gms.tasks.zzv.run(zzv.java)
at com.google.firebase.firestore.util.ThrottledForwardingExecutor.lambda$execute$0(ThrottledForwardingExecutor.java)
at com.google.firebase.firestore.util.ThrottledForwardingExecutor.lambda$execute$0$ThrottledForwardingExecutor(ThrottledForwardingExecutor.java)
at com.google.firebase.firestore.util.-$$Lambda$ThrottledForwardingExecutor$MfIJbVuxZtLwosAgPzPA-cU66Ko.run(-.java)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
at java.lang.Thread.run(Thread.java:818)
Logs
Crashlytics - Custom logs
Application: com.myapp.name
Platform: android
Version: 1.0.9 (9)
Issue: 249cf5c99a9e11ad407fca359f935c56
Session: 60FE32E9034000012DDEB2B2FD120ABC_DNE_0_v2
Date: Mon Jul 26 2021 09:28:38 GMT+0530 (India Standard Time)
0 | Mon Jul 26 2021 09:28:35 GMT+0530 (India Standard Time) | screen_view
Device info
Device Information img

I am getting an error while loading a PDF in my app with the library github.barteksc.pdfviewer

This is the error I am having in my logcat
E/PDFView: load pdf error
java.io.IOException: cannot create document: File not in PDF format or corrupted.
at com.shockwave.pdfium.PdfiumCore.nativeOpenMemDocument(Native Method)
at com.shockwave.pdfium.PdfiumCore.newDocument(PdfiumCore.java:126)
at com.github.barteksc.pdfviewer.source.InputStreamSource.createDocument(InputStreamSource.java:37)
at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:53)
at com.github.barteksc.pdfviewer.DecodingAsyncTask.doInBackground(DecodingAsyncTask.java:25)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)

That was reported in barteksc/AndroidPdfViewer issue 175
Had the same error. For some reason reading PDF directly from assets did not work, and gave the above mentioned error.
So copied it from asset to cache dir, and then all worked.
But first, double-check you can open that PDF file (independently of your execution environment, outside of your Java program).

Android Studio with Galaxy S7 - Android 7.0

I'm trying to debug with Androd Studio 2.3.1 an app (min sdk 16, target sdk 24) with a Samsung Galaxy S7 (Android 7.0 installed), but I get the following exception and the app stops:
com.venework.app.venework E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.venework.app.venework, PID: 3556
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.venework.app.venework/com.venework.app.venework.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.venework.app.venework.MainActivity" on path: DexPathList[[zip file "/data/app/com.venework.app.venework-1/base.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_9_apk.apk"],
nativeLibraryDirectories=[/data/app/com.venework.app.venework-1/lib/arm64, /system/lib64, /vendor/lib64]]
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2844)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3008)
at android.app.ActivityThread.-wrap14(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1650)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6688)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.venework.app.venework.MainActivity" on path: DexPathList[[zip file "/data/app/com.venework.app.venework-1/base.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_0_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_1_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_2_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_3_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_4_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_5_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_6_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_7_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_8_apk.apk", zip file "/data/app/com.venework.app.venework-1/split_lib_slice_9_apk.apk"],nativeLibraryDirectories=[/data/app/com.venework.app.venework-1/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
If I test with any other device everything is ok... any hint ? I have run out of options. Thank you

SOLUTION
The splash-screen image was in the wrong folder. drawable instead of drawable-xxhdpi... really a stupid problem.... with devices with low resolution displays it didn't make any difference, but with a high-res display like that of the Samsung S7 is completely another story...

Failed with exit code 1 Error In cordova

C:\phoneGap\firstApp>cordova run android
ANDROID_HOME=C:\Android\sdk\
JAVA_HOME=C:\Program Files\Java\jdk1.8.0_74 Unzipping C:\Users\Somnath Sarkar\.gradle\wrapper\dists\gradle-2.13-all\7hsc6vr6mi3i6i5m7q9hj4ci1q\gradle-2.13-all.zip to C:\Users\Somnath Sarkar\.gradle\wrapper\dists\gradle-2.13-all\7hsc6vr6mi3i6i5m7q9hj4ci1qException in thread "main" java.lang.RuntimeException: java.util.zip.ZipException: error in opening zip file
at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:78)
at org.gradle.wrapper.Install.createDist(Install.java:47)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.zip.ZipFile.<init>(ZipFile.java:163)
at org.gradle.wrapper.Install.unzip(Install.java:160)
at org.gradle.wrapper.Install.access$400(Install.java:29)
at org.gradle.wrapper.Install$1.call(Install.java:70)
at org.gradle.wrapper.Install$1.call(Install.java:47)
at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65) ... 3 more
Error: cmd: Command failed with exit code 1 Error output: Exception in thread "main" java.lang.RuntimeException: java.util.zip.ZipException: error in opening zip file
at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:78)
at org.gradle.wrapper.Install.createDist(Install.java:47)
at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:129)
at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.zip.ZipFile.<init>(ZipFile.java:163)
at org.gradle.wrapper.Install.unzip(Install.java:160)
at org.gradle.wrapper.Install.access$400(Install.java:29)
at org.gradle.wrapper.Install$1.call(Install.java:70)
at org.gradle.wrapper.Install$1.call(Install.java:47)
at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65) ... 3 more

Delete "gradle-2.13-all.zip" folder and everything in this directory:
C:\Users\Somnath
Sarkar.gradle\wrapper\dists\gradle-2.13all\7hsc6vr6mi3i6i5m7q9hj4ci1q\
Download the gradle zip manually click here
Paste the gradle zip folder in
C:\Users\Somnath
Sarkar.gradle\wrapper\dists\gradle-2.13-all\7hsc6vr6mi3i6i5m7q9hj4ci1q\
Run your
Codova build android

Caused by: java.util.zip.ZipException: error in opening zip file which means the concurrent ZIP file was Corrupted.
Solution :
Please Check the Zip file in C:\Users\YourUsername\.gradle\wrapper\dists\gradle-2.13-all\someRandomSting\ size and if it'size not equals to 66.6M then Download and Replace with this

Error on using weka library on android (Want to Implement Machine Learning in an Android Application)

For implementing Machine Learning in an Android Application, I am using 'WEKA Tool' which I have included it on the Project 'libs' and compile it from the 'gradle' of project.
But while running on the phone when that functions invoked which doing the classification (calling 'RandomForest Classifier'), my app goes crashed.
I am getting this 'Runtime Error'. Can anyone help me please?
Unable to create WEKA_HOME (/wekafiles)
Unable to create packages directory (/wekafiles/packages)
Unable to create repository cache directory (/wekafiles/repCache)
D/AndroidRuntime: Shutting down VM
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.weirdmyth.testapp, PID: 31474
java.lang.NoClassDefFoundError: Failed resolution of: Ljava/awt/GraphicsEnvironment;
at weka.core.packageManagement.PackageManager.setProxyAuthentication(PackageManager.java:191)
at weka.core.WekaPackageManager.establishWekaHome(WekaPackageManager.java:377)
at weka.core.WekaPackageManager.<clinit>(WekaPackageManager.java:162)
at weka.core.Utils.readProperties(Utils.java:174)
at weka.core.Capabilities.<init>(Capabilities.java:275)
at weka.classifiers.AbstractClassifier.getCapabilities(AbstractClassifier.java:508)
at weka.classifiers.trees.RandomTree.getCapabilities(RandomTree.java:602)
at weka.classifiers.trees.RandomForest.getCapabilities(RandomForest.java:182)
at weka.classifiers.meta.Bagging.buildClassifier(Bagging.java:701)
at com.example.weirdmyth.testapp.MainActivity.showExtractData(MainActivity.java:68)
at com.example.weirdmyth.testapp.MainActivity.access$000(MainActivity.java:18)
at com.example.weirdmyth.testapp.MainActivity$1.onClick(MainActivity.java:35)
at android.view.View.performClick(View.java:4794)
at android.view.View$PerformClick.run(View.java:19905)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:139)
at android.app.ActivityThread.main(ActivityThread.java:5298)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:950)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745)
Caused by: java.lang.ClassNotFoundException: Didn't find class "java.awt.GraphicsEnvironment" on path: DexPathList[[dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-weka_24a0e957b7a2bd7b1eca884c1d1fe17134d04e02-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-support-annotations-24.2.0_1d91a870686be0d9b2c0cad6f095599608f8ea8b-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-internal_impl-24.2.0_e60a43d4d67966d22f555860d8f3ea89bf40a00d-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-internal_impl-24.2.0_bab1238d93c9b1e214aa74253243e0e0a1179d1b-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-internal_impl-24.2.0_ac3ce21dd47241b373379a2a2250d916ddec89f2-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-internal_impl-24.2.0_86622e6ad735878a3262fd8fb6bc9c316447f2bd-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-internal_impl-24.2.0_024d25ee6599778d6213941fb989deeaa23d0a37-classes.dex", dex file "/data/data/com.example.weirdmyth.testapp/files/instant-run/dex/slice-com.android.support-support-vector-drawable-24.2.0_a300254740b0ce696848c36d6b2c7e26898aba9c-classes.dex", dex file "/data/data/com.example

try using this one: https://github.com/rjmarsan/Weka-for-Android
As writer says: and 100% functionality is not promised. However, it's sure better than nothing.