Packing Error

Hi everyone sorry for my newbeeness i tried to pack my test project in ue4 on apk form but got an error that tells me nothing, mb can any one explain me what did i wrong and what should i do to fix that? Just want to make an apk for selftests on my phone

UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): ERROR: cmd.exe failed with args /c “E:\Project2\MyProject\Intermediate/Android/APK\gradle\rungradle.bat” :app:assembleDebug
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): (see C:\Users\UrfinJusse\AppData\Roaming\Unreal Engine\AutomationTool\Logs\C+Program+Files+Epic+Games+UE_4.21\Log.txt for full exception trace)
PackagingResults: Error: cmd.exe failed with args /c “E:\Project2\MyProject\Intermediate/Android/APK\gradle\rungradle.bat” :app:assembleDebug
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): AutomationTool exiting with ExitCode=1 (Error_Unknown)
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): BUILD FAILED
PackagingResults: Error: Unknown Error