Suite Fatal error when upgrading
 

I got this message on Step 7 when upgrading from 4.01 to 4.02:

Step 7) Merge template changes
Merged template successfully: postbit_legacy (style: 1)
Merged template successfully: SHOWTHREAD (style: 1)

Fatal error: Out of memory (allocated 44302336) (tried to allocate 6483 bytes) in /customers/sitename.com/sitename.com/httpd.www/includes/class_diff.php on line 146

What should I do?