Hi @bydesigndm
We’re sorry to hear about this issue that you’re unable to access the posts with the Yoast Duplicate Post plugin enabled.
Could you check if you have the latest version of WordPress 5.8.2, Yoast Duplicate Post 4.3, and the latest version of your other plugins and themes? If not, please do update and see if this helps with the issue.
You’ve mentioned that you receive a critical error when you try to access your posts and pages. Would it be possible for you to provide more information (via uploading a screenshot on snipboard.io or a similar website) of any relevant error messages that you are receiving? If you could check your server’s error log and provide the specific error message, this would be helpful.
Also, we see problems occur in combination with another plugin or theme. The fastest way to rule out any conflict, is to deactivate all non-Yoast plugins and switch to a standard theme like Twenty Twenty.
Please test this on your development or staging site, if you have one. If not, we recommend using the Health Check & Troubleshooting plugin. This plugin has a troubleshooting mode, which does not affect normal visitors to your site.
If you’re unfamiliar with checking for conflicts, we’d like to point you to a step-by-step guide that will walk you through the process: How to check for plugin conflicts
We recommend starting out with a default WP theme such as TwentyTwenty and only the Yoast Duplicate Post plugin enabled, and then start by enabling your preferred theme, and then your plugins, one-by-one, until you are able to reproduce the issue and identify the conflicting plugin or theme.
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Hi @imfromio
We are sorry you’re having a similar issue. Please open a new request. That way it’s easier to track issues and provide assistance. Thanks!