cannot add google account

I'm not sure what you mean -- yes it persists after a reboot? Yes it persists after a cache partition wipe?
 
What if you go to the App Manager, select Secure Folder, and Clear Cache? If you don't have any important data stored there, Clear Data as well.
 

Forum statistics

Threads
960,439
Messages
6,982,390
Members
3,164,514
Latest member
Nazeer zaheen