There are times when you get this error because of a misconfigured redirection issue. This can be frustrating for the users of WordPress. One of the best ways of solving this problem is to change the website URL without access to the admin area. If you want to do this then you will have to follow some of the instructions. When you don’t have access to the WordPress admin area, you can make an update in the settings through the wp-config.php file. For this, just connect to the website through an FTP client.

  

There could be a plugin issue that causes this error so you must look at the plugins. You just have to find out which plugin is causing the error and then disable it temporarily to fix this error. Also, activate a new plugin in place fo the old one.

Thanks for sharing.