Unknown issue with Google Play Services Error

A

AC Question

I have latest Google Play Services and Gmail installed in my phone running android 5.1. Whenever I am opening gmail, it is giving "Unknown issue with Google Play Services" and is not synchronising.

I have already tried many methods like clearing google play services data and gapps data and uninstalling google play services to factory installed and to update it again, but nothing worked.

Do anyone have any solution?
 

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