[Plugin:Gravity Forms] Cannot edit form entries

Whenever I attempt to edit Gravity Form entries, I get a blank page that says “Error detected by Application Firewall. Please contact support if you have any questions.” I contacted Gravity Forms support and they said I should run a theme/plugin conflict test but that didn’t work. Using Gravity Forms ver. 1.8.19.

Not really sure what to do about this. All I need is to be able to edit the form entries.