Error while packaging a game( error log is in the description)

Hii,
I have created my game in unreal engine 4.21, but while packaging I found this error and not able to solve it.
So please help me
I am Giving logs below:-
PackagingResults: Warning: License for package Android SDK Build-Tools 26.0.2 not accepted.
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): ERROR: cmd.exe failed with args /c “D:\unreal engine projects\Space_Runner02_2\Intermediate/Android/APK\gradle\rungradle.bat” :app:assembleRelease
UATHelper: Packaging (Android (Multi:ASTC,PVRTC,DXT,ATC,ETC2,ETC1)): (see for full exception trace)
PackagingResults: Error: cmd.exe failed with args /c “D:\unreal engine projects\Space_Runner02_2\Intermediate/Android/APK\gradle\rungradle.bat” :app:assembleRelease
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

The build failed for some reason. You need to look at the full log, the bit you’ve shown is only it telling you it failed to package.

See  for full exception trace

Thanks I will read that file and if I don’t Find anything I can solve I will put the Whole log attached to this question.

I went through the logs but couldn’t understand the problem(I am from non IT field) so,
I have uploaded my full log as U suggested

link text