500 Error only one one page in the WP admin

It means you have a PHP syntax error. You need to consult the logs or turn on debug mode. In wp-config.php in your root wordpress directory, find the line as follows:

define( 'WP_DEBUG', false );

and change it to: 

define( 'WP_DEBUG', true );

Refresh your page that appears blank to find the error. If it still does not show up, it means you may need to change your php.ini settings to display errors.

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