When i try to edit the header or footer via front end or backend i am getting an error. Preview could not be loaded. All other pages i am able to edit. But this is not working. Please advice. I have added login details.
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We found the issue from the plugin you installed: Request Quotes
After deactivate it, all are working fine now.
If you have any issues you can try the solution deactivate each plugin then check again.
Hope this helps!