Android Studio Error: Failed to delete some children. This might happen because a process has files open

   the error in build APK (s) is as follows:

Unable to delete directory 'F:\AndriodStudioProjects\EDM\app\build\outputs\apk\debug'
  Failed to delete some children. This might happen because a process has files open or has its working directory set in the target directory.
  - F:\AndriodStudioProjects\EDM\app\build\outputs\apk\debug\app-debug.apk

solution: close the folder of \… \ app/build/outputs/APK/debug

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