Plugin install causing Fatal Error

Hi guys,

Over the last few months when we install or update various plugins on our site we get this error every time and our site goes down.

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 130968 bytes) in /home/lighthousewebdev/public_html/wp-includes/cache.php on line 113

It is for this site: http://www.investorsinchildren.org/

We fix it by going in a renaming the plugin we just installed, breaking the plugin and then removing or deactivating it.

The plugins that cause it have been Membership, Buddypress and other ones, it doesn’t seem to be one plugin that causes the issue. Is there anything in the core code that is causing the error at all? We are having trouble installing new plugins because of it.

Many thanks in advance for your help

Adam