[Plugin: Events Category] Warning in plugin.php

Hi,

I get the following error

Warning: Parameter 1 to eventscategory_recalculate_max_num_pages() expected to be a reference, value given in /var/www/vhosts/pymempresario.com/httpdocs/wp-includes/plugin.php on line 166

Can anyone help with this?

Thanks!

http://wordpress.org/extend/plugins/events-category/