A problem was found with the configuration of task ':app:createDebugCompatibleScreenManifests' (type 'CompatibleScreensManifest').
or
unexpected element (queries) found in manifest or
A problem was found with the configuration of task ':path_provider:generateDebugRFile' (type 'GenerateLibraryRFileTask').
android/build.gradle
classpath 'com.android.tools.build:gradle:3.6.4'
android/gradle/wrapper/gradle-wrapper.properties
distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
solution from: https://github.com/miguelpruivo/flutter_file_picker/wiki/Troubleshooting#-issue