i'm receiving this strange error, does anyone knows about it?
Severity: Notice --> unserialize() [<a href='function.unserialize'>function.unserialize</a>]: Error at offset 0 of 286 bytes /Applications/XAMPP/xamppfiles/htdocs/login/system/libraries/Session.php 723
thanks
This means that probably something went wrong with the string of user_data inside your session-table. It could be that the value of user_data was editted and this can make a serialized string "corrupt".
You should check the documentation on php.net about serialization. About how this process works. http://php.net/manual/en/function.serialize.php