Website Crash after de-activating Gravity Forms

Hi, I used the Gravity Forms plugin for two years on a company website, however now I no longer need the plugin. Each time I have attempted to deactivate/delete the plugin it has caused a Fatal Error on my website. Can you please help me with this?
Thank you

Hey Emily,

I think the first thing to try is enabling debugging to see if we can get a details on the error you’re getting. To do so, go to your wp-config.php file and set the following:

define( 'WP_DEBUG', true );
define( 'WP_DEBUG_LOG', true );
define( 'WP_DEBUG_DISPLAY', false );

Then afterwards, go ahead and recreate the critical error again. Once that’s done, go to your wp-content folder and here you should see a debug.log file, please attach this file here.

Thank you!