Well, it's not an error, it's only a warning. The code it's complaining about is for the user and the admin blocks (that's why admins get two warning messages). Need to look into it to see how to rewrite it ...
In the meantime, try to change the
error_reporting
at the beginning of lib-common.php to read
Text Formatted Code
error_reporting(E_ERROR | E_PARSE | E_COMPILE_ERROR);
i.e. remove the
E_WARNING
and see if that helps.
bye, Dirk