After upgrade from 1.3 to 2.1 RC4 I got this error in some pages.

Fatal error: Function name must be a string in /var/www/html/bitweaver/liberty/plugins/mime.default.php on line 234

When I do a login with my username I got, but if I use de admin, this error didn't happen.

When I tried to open a wiki page that have acentuation in name, I got this error.

How can I fix it ?

Thanks.

Fred