If you are seeing a 404 error when trying to open the SeedProd editor, the cause is typically an Apache server limit being exceeded. When SeedProd loads the editor, it sends a large request to the server. If the server’s SubstituteMaxLineLength limit is set too low, Apache rejects the request and returns a 404 error instead.

Option 1: Contact Your Hosting Provider

The simplest approach is to contact your hosting provider and ask them to increase the Apache SubstituteMaxLineLength limit for your site. This requires server-level access that most hosting providers can handle quickly through their support team.

Option 2: Add the Fix to Your .htaccess File

If you have access to your site’s .htaccess file, you can apply the fix yourself. Add the following code to your .htaccess file, which is located in the root directory of your WordPress installation:

<IfModule mod_expires.c>
   SubstituteMaxLineLength 10M
</IfModule>

You can edit the .htaccess file using FTP, your hosting control panel’s File Manager, or a plugin such as Htaccess File Editor. Add the code at the end of the file and save your changes.

Important: Always create a backup of your .htaccess file before making any changes. An incorrect edit can make your site inaccessible. If you are unsure, use Option 1 and let your hosting provider handle it.

After Making the Change

Once you have applied either fix, clear all caches before testing:

• WordPress cache: Use your caching plugin’s Purge or Clear Cache option.
• Server cache: Ask your hosting provider to clear the server cache, or use your hosting control panel if available.
• Browser cache: Press Ctrl+Shift+R (Windows/Linux) or Cmd+Shift+R (Mac) to force a hard reload.

Then try opening the SeedProd editor again to confirm the 404 error is resolved.

If the 404 error persists after applying the fix and clearing all caches, contact the SeedProd support team. Include your hosting provider name and whether you were able to modify the .htaccess file, which will help narrow down the cause.