activation created 500 error after upgrading from 1.4.6 to 2.2.0.2

Hi,

I’m facing errors when I try to activate Anspress after upgrading from 1.4.6 (was working like a charm) to 2.2.0.2…

Already done:
– User profile editor > reset done (default admin capabilities)
– Max execution time > changed from 60 to 160
– Addons added prior to try to activate

1) 500 error when I try to activate from Network admin (ok maybe not supporting multisite….)
2) “You do not have sufficient permissions to access this page.” error message when I try from main site or sub site (I have reset the admin profile credentials….Unsuccessfully)

Can you help?

Thank you

R.