Fatal error message on page?!

Hi, Can anyone help please.
I am trying to edit an existing page but instead of seeing the content, I see this error message and cannot edit the page at all…See error message below

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 30720 bytes) in /home/vocalt/public_html/wp-admin/admin-header.php on line 32

Thank you in advance for taking the time to look into it and hopefully solve the problem.