Activating Worpress Plug In causes HTTP 500 error

Hello, I am using worpress. Installed Wishlist Membership plug in. Then went in to activate the plug in and got HTTP 500 error. Went through the terminal and removed the plug in directory and site went back up. Site doesn’t go down on install but goes down on activation of the plug in. Any ideas?

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In general a 500 error results from an error in the PHP code. If you are running WordPress on Ubuntu 16.04 it is possible that the plugin is using features from PHP 5.x that are not present in PHP 7. You can review the details of the error in /var/log/apache2/error.log. If it does appear to be a PHP 5 vs PHP 7 issue you may want to consider running your site on 14.04 instead of 16.04 (both remain supported with security updates).