PHP fatal error: allowed memory size exhausted

[geek]

Tried to go to the diagnostic states summary page, but it ends with a fatal error.

Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 20480 bytes) in /usr/local/www/diag_states_summary.php on line 50

I am guessing somewhere I have to edit the PHP file? can someone tell me where it is located?

P.S - The other states related pages don't open either
/diag_resetstate.php
/diag_dump_states.php