fatal Memory error

keep getting this: Fatal error: Out of memory marketpress.php on line 4491

my testing server uses the marcolm.com domain and is hosted by godaddy, when i did the migration to a clients site, that is hosted by mediacatch, i had to disable and delete the plugin because it gives me that error, any idea what i should do. memory limit is already set to 128 and we even attempted briefly with the host to make it 256