Simple:Press Install problem need help please

Hi
Today I tried installing Simple:Press and I received an error message that I need help correcting…..
Could someone please tell me what this means and how I might fix the error message….

Here is the message:
Fatal error: Allowed memory size of 268435456 bytes exhausted (tried to allocate 71 bytes) in /home/ministr0/public_html/ministrycampfire.com/wp-includes/functions.php on line 3845

Thank you in advance for your help