I kep getting this type of error when I try to activate a plug in or get support from inside my blog

Fatal error: Allowed memory size of 41943040 bytes exhausted (tried to allocate 4864 bytes) in /hermes/bosweb26a/b1857/ipw.michie/public_html/MichelleGreenman/wp-admin/includes/class-wp-list-table.php on line 190