a) Check for the actual error messages in the store's myDebug-xxxxxxx.log files: The built-in debug logging will create files
in your website's /logs/ folder, named "
myDebug-xxxxxx.log" (or "myDebug-adm-xxxxxxx.log" if they are from the admin side).
(If you're on an older version of Zen Cart such as v1.3.9 or v1.5.0 then these will be in the /cache/ folder instead of the /logs/ folder.)
(To access these files, use your FTP program to connect to your webserver. Your hosting company can help you with how to do that.)
You'll want to read the contents of these files to see what the actual PHP errors are.
Then search this FAQ area for your error message and/or see the "Dealing with Error Messages" section, later in this article.
NOTE: When errors start occurring, the number of log files in this folder can grow very quickly. You can purge them by using the Debug Log File Purge option from your Admin->Tools->Store Manager screen.
You will of course want to review the contents of those files first so you can address the problems they're recording.
If you don't purge them, it will eventually slow down your website's performance, and use up a large amount of disk space.
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