error message

I have been trying to setup sweetdate theme.

But I have a problem with buddypress plugin and rtMedia for buddypress plugin.

After I finished the step of setting up buddypress, when I clicked Permalink setting, there is an error message “ Fatal error: Out of memory (allocated 110886912) (tried to allocate 49152 bytes) in /home4/bingo592/tripanddate.com/wp-content/plugins/buddypress-dis/bp-messages/classes/class-bp-messages-thread.php on line 570”

I had asked hostgator staff (my server) to increase the file size limit to 512MB but this error message still shows.
So I had to deactivate buddypress plugin and rtMedia for buddypress plugin so that this error message won’t show.

I need all plugins to work for the website.

Please help.

Regards,
Natcha