Error building Player: IOException: Failed to Move File

Question

I keep getting this error when I try to use my .aar plugin created in android studio on Unity 3d

Error building Player: IOException: Failed to Move File / Directory from 'Temp/StagingArea\android-libraries\app-release\classes.jar' to 'Temp/StagingArea\android-libraries\app-release\libs\classes.jar'.

Answer 1

Use provided scope in gradle.

https://sinking.in/blog/provided-scope-in-gradle/

dependencies 
{
    provided fileTree(dir: 'libs', include: ['*.jar'])
}

Answer 2

You need to remove 'libs/classes.jar' in your aar(use your favorate archive manager, it's just ZIP file), since Unity will inject it by self. Unity will fail if there's already one.