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This thread is resolved. Here is a description of the problem and solution.
Sometimes, you may run into a “500 Internal Server Error” when you try to access your site’s WordPress administration area. The error can be triggered by a plugin but usually, it is related to a particular issue with your server configuration, like memory limit, .htaccess file corruption, etc.
You can find more information and possible solutions for this error on the following page: https://wpml.org/faq/500-error/
If you are unable to resolve this error following one of the many online tutorials dealing with this error, it is strongly advised that you contact your hosting provider and ask for their assistance.