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How to fix "Could not find compile target android-30 for modules :app" error in Andriod Studio while building apps?

I am trying to build an application from a GitHub repository repo. It's my first time using Andriod Studio and what I want is to run this application on my android phone, so I don't have basic knowledge about Java development or android SDKs.
When I am trying to set up the Studio, when I hit the "run app" button an error occured reading 'Could not find compile target android-30 for modules :app'.
I have tried to uninstall and reinstall all SDKs needed and every time I click 'Sync Project with Gradle Files' this error will pop up.
Anyone who knows about Andriod Studio could help me with this issue? I appreciate every answer and hope this issue could be resolved very soon.

Close Android Studio. Run it as Administrator. Then create a new project. You probably had an error before the project was created and ignored it
(error : Failed to read or create install properties file.).
The file "Android SDK Platform 32" (I had platform 30) needs to be installed and so if you ran Android Studio without administrator rights it won't install. With Administrator rights it'll install automatically and that's it.

Can't install Dropbox plugin for Android Studio

I'm trying to add the latest (v5.1.1) Dropbox plugin to my Android Studio install (Bumblebee 2021.1.1) on Win10. I downloaded the .jar file from releases/v5.1.1 folder to an empty folder, then tried to install it using this method: from the Studio main menu I chose Plugins, selected the gear icon followed by Install Plugin From Disk, browsed to the .jar file location, selected it then pressed OK. I got an error message: "Fail to load plugin from file dropbox-sdk-java-5.1.1.jar". I tried installing the -5.1.1-javadoc.jar file using the same method, with the same result. I don't need the sources, I just want to use the SDK. Any ideas? TIA!

First, I think you meant "Android Studio" instead of "Visual Studio"?
If so, it sounds like you're attempting to install the Dropbox Java SDK as a plugin to Android Studio itself. The Dropbox Java SDK is not an Android Studio plugin though. It is a package for connecting to the Dropbox API from your Java app.
To install the Dropbox package in your app, you should use Maven or Gradle, as instructed here.
The Dropbox Java SDK also comes with an example Android app that uses the Dropbox package.

Thanks, Greg; your answer pointed me in the right direction. I had already added an 'implementation' directive to my Gradle file as per the directions on GitHub. However, I took the instruction to add the directive by editing my "project's build.gradle" too literally; I added it to the Project build.gradle file instead of adding it to the Module build.gradle. Problem solved!

Android Studio 2.2.3: Gradle project sync failed. Basic functionality (e.g. editting, debugging) will not work properly

I needed to preinstall my laptop and switched to Windows 10 . Before that I made and saved my project in Android Studio 2.2.3 and I downloaded the same version of Android Studio after preinstallation, but when I choose Open Existing Project I got the following message:
Failed to sync gradle project 'ApplicationName' Error:Unable to find
method
'org.gradle.api.artifacts.Configuration.setExtendsFrom(Ljava/lang/Iterable;)Lorg/gradle/api/artifacts/Configuration;'.
Possible causes for this unexpected error include: Gradle's dependency
cache may be corrupt (this sometimes occurs after a network connection
timeout.)
The state of a Gradle build process (daemon) may be corrupt. Stopping
all Gradle daemons may solve this problem.
Your project may be using a third-party plugin which is not compatible
with the other plugins in the project or the version of Gradle
requested by the project.
Blockquote
I did all the three steps suggested by Android Studio to fix my project, but none of them worked.

Your gradle version is: 1.8 which is not working anymore so you probably have to update it:
1- Go to -> https://gradle.org/install
check out the latest verion number.
2- In your project directory navigate to \gradle\wrapper\ directory and edit:
gradle-wrapper.properties file.
change:
https://services.gradle.org/distributions/gradle-1.8-all.zip
to:
https://services.gradle.org/distributions/gradle-3.3-all.zip
3- go to Tools→Android→Sync Project with Gradle files
4- If sync doesn't do the job restart Android studio

Just go to file -> Invalidate Caches/Restart -> Invalidate and Restart

Update your gradle.
Open File > Project Structure > Project Tab
Android Studio has built in project structure menu to check and update gradle and plugin used in the current project.
Below Website gives a detailed explanation on how to update gradle and gradle plugin of Android Studio.
Update gradle plugin Android Studio

This error also occurs when Android Studio is working offline.
To check this below points:
1.Open the Preferences window by
clicking File > Settings (on Mac, Android Studio > Preferences).
2.In the left pane,
click Build, Execution, Deployment > Gradle.
3.Check the Offline work checkbox. If it is checked then Android Studio is working offline you have to unchecked it.
-
4.Click Apply or OK
.

The error is thrown because google has updated the android plugin and gradle integration.
You have to update android studio to the latest one.
Android Studio will suggest you updates and you have to update by clicking on the notification inside android studio at the bottom.
Automatically the above error will be resolved for you.

Settings > Experimental > turn off "Only sync the active variant"

First check why the build is failing, in my case it was that I had not accepted licenses for platform 29 and by default platform 30 was installed.
To fix this I went to tools >> sdk manager then installed pplatform 29 and accepted licenses [ALL GUI]. It was solved after that.

Files > Settings > Appearance & Behavior > System Settings > android SDK > SDK Platform.
From SDK Platform Select and Install Latest API Level (31) SDK.
After Successfully Installation Restart Android Studio.

INDE Multi-OS engine in android Studio

I want to use the new plugins INDE Multi-OS engine in my android studio,
I download and install, everything seems normal.
When I go to treat to use on android studio, nothing appears .. leaves create or to test the hello world.
that is not bad
as I add the plugins ?

Probably Multi-OS Engine installer didn't install plugins for Android Studio correctly.
You can install Multi-OS Engine plugins manually. Go to Android Studio -> Preferences -> Plugins and install two plugins from /Applications/Intel/multi_os_engine/intellij_plugins folder (you will see two zip files there) manually using "Install plugin from disk" button.

What steps do I need to take to convert my Eclipse Android project into a Gradle project?

I was wondering if it is an easy or worthwhile effort to convert my current Android project in Eclipse into a Gradle Project. Is there a generic build.gradle file I could start with that has common build tasks for Android? Would I just need to download a Gradle plugin for Eclipse or would I need to download Gradle by itself? Are there available tasks to run the project on a connected device like the Eclipse Android plugin can already do? Any input is appreciated.

Any project with build.gradle is Gradle project.
You can add build.gradle via File -> Export -> Android / Generate Gradle build file
or use build.gradle template for classic Android project check
gh.c/N/n-1/b/m/o.n.e.e.g/docs/android/build.gradle.
see http://www.nodeclipse.org/projects/gradle/ for info about Gradle support in Eclipse
Are there available tasks to run the project on a connected device like the Eclipse Android plugin can already do?
there is android-command plugin referenced in template.
Be aware that all Android-Gradle related is currently beta, including Android Studio.
I recommend to read docs well
http://tools.android.com/tech-docs/new-build-system
http://www.gradle.org/

I don't know of any standalone Gradle tools, but if you install Android Studios, and import your eclipse project, it elegantly converts it to Gradle for you. This is what I did.

If your target IDE is android studio.I use android studio 0.8.9 and from experience when I am moving my eclipse projects I simply go over to android studio,under the file menu and import the eclipse project.Android studio uses the latest version of the gradle plugin to do the job of proper conversion.Note:Make sure your gradle plugin option is turned on to work online.