Can't login to WordPress Admin after installing plugin

I was attempting to install the WP Smush plugin and my wordpress admin just crashed. I am now stuck at an error page and I can’t seem to login or access my admin controls.

Can anyone advise what I should do?

Here’s the error message:
https://thegoodfolks.com.sg/wp-admin/

Warning: require_once(/home/thegoodf/public_html/wp-content/plugins/wp-smush-pro//extras/free-dashboard/module.php) [function.require-once]: failed to open stream: No such file or directory in /home/thegoodf/public_html/wp-content/plugins/wp-smushit/wp-smush.php on line 861

Fatal error: require_once() [function.require]: Failed opening required ‘/home/thegoodf/public_html/wp-content/plugins/wp-smush-pro//extras/free-dashboard/module.php’ (include_path=’.:/usr/lib/php:/usr/local/lib/php’) in /home/thegoodf/public_html/wp-content/plugins/wp-smushit/wp-smush.php on line 861