This version only understands SDK XML versions up to 2 but an SDK XML file of version 3 was encountered

[zainulabidin008]

Warning: This version only understands SDK XML versions up to 2 but an SDK XML file of version 3 was encountered. This can happen if you use versions of Android Studio and the command-line tools that were released at different times.
Warning: unexpected element (uri:"", local:"base-extension"). Expected elements are <{}codename>,<{}layoutlib>,<{}api-level>

[RecepBorekci]

I have the same issue. Tried plenty of fixes but none of them worked out. I guess the files are outdated. I'll create a new project and copy the main.dart codes and maybe the app icon.

[albercode10]

The easy way to fix this is to delete android/ios folder and run: flutter create .

The hard way is to go to android/build.gradle and change:

dependencies {
     classpath 'com.android.tools.build:gradle:7.1.3' // use 7.1.3 or higher
}

then go to gradle/wrapper/graddle-wrapper.properties and change distributionUrl to something like this:

distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip

[sanjorge01]

The easy way to fix this is to delete android/ios folder and run: flutter create .

The hard way is to go to android/build.gradle and change:

dependencies {
     classpath 'com.android.tools.build:gradle:7.1.3' // use 7.1.3 or higher
}

then go to gradle/wrapper/graddle-wrapper.properties and change distributionUrl to something like this:

distributionUrl=https\://services.gradle.org/distributions/gradle-7.4-all.zip

I do that and appear that. what i can do?

Could not find method classpath() for arguments [com.android.tools.build:gradle:7.1.3] on object of type org.gradle.api.internal.artifacts.dsl.dependencies.DefaultDependencyHandler.