User login failed after upgrade from 5.6.14 to 5.7.6

[DarkAvenger32]

Hello guys,

I've executed an upgrade from 5.6.14 to 5.7.6 and now users can't log in.

following error are reported :

[Maximus]

Hello,
Please investigate an error log file in the data/logs directory to get more info about the error.
What Mysql version do you use?

[Maximus]

It seems that this error applies to your database user permission. Please set the permissions (edit privileges) for your database user.

[DarkAvenger32]

Thank you , problem was sorted.