If you have ever dealt with this WordPress error, you are probably well aware of how frustrating it can be to troubleshoot. This can happen when you upgrade or install plug-ins in WordPress. In fact, simply upgrading the WordPress core installation to a newer version can produce this same memory issue.
The issue stems from a memory limit that is placed on the allocated PHP memory that your WordPress installation is allowed to use on the server. One of the fundamental purposes for this limit is web server security. How much space your particular WordPress installation is allowed to use depends on several factors, but the main one is whether or not your web space is located on a “shared” hosting server.