Got an error when building AssetBundles. "Target platform mismatch"

Hi
I got error when building AssetBundles.

1. Pop up error window appears:
"Build failure
Internal error: Target platform mismatch"

2. Errors in console are thrown:
2.1. Menu Edit/Graphics Emulation/OpenGL ES 3.0 can't be checked because it doesn't exist
UnityEditor.BuildPipeline:BuildAssetBundles(String, BuildAssetBundleOptions, BuildTarget)
CreateAssetBundles:BuildAllAssetBundles() (at Assets/Editor/CreateAssetBundles.cs:9)

2.2. Error building Player: UnityException: Build failure
Internal error: Target platform mismatch

Unity version
5.6.0f3
5.6.1f1

Would anyone kindly tell me how to solve this?
Thank you very much.

Regards,

 

Solved.

For anyone who meets the same problem.
I just uninstalled unity, and reinstalled it again.
And the problem is gone.

But I don't catch the reason.

Thank you to anyone who payed attention to this thread.

 

Thanks