Working plugin code breaks admin

Not sure if this is the actual answer for this but on line 252 of the pastebin link change:

 <form action="'.site_url().'/wp-admin/admin.php/options-general.php" method="get">

to 

 <form action="'.admin_url('options-general.php').'" method="get">

When I submitted the form in the settings it giving me a not found error.

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