Normally this “scrape nonce check, please try again” error show when you editing a PHP file(likely on header.php) and save it. And here is how to fix it.
Clear your website cache with WordPress plugin like WP Super Cache, as well as browser cache and server cache. If the error remains, then try
2.Deactivate plugins one by one
Deactivate your recently installed plugin one by one; see any of it causes the conflict.
Once you find which plugin caused the error, you have a few options to solve it.
- Contact the plugin author or the development team and let them know the situation; hopefully, they can solve the issue quickly.
- Replace it with another plugin.
- If there is no error message, another plugin conflicts with it; repeat the step and decide which plugin to replace.