I have upgrade from 2.4.6. to 3.0.1. I get one or more of “unserialize(): Error at offset…” for each page which is loaded in my browser. My old config file char set was as follows:
client_charset = utf-8
connection_charset = utf-8
database_charset = utf-8
charset_normalization = Off
I have tried the default values also.
These match with my new config file. I tied matching them before doing the actual upgrade. What else I can check?
Actually I think it is irrelevant to upgrade itself. because I get the error even on install and installUpgrade pages.