Pay now button stopped working later plugin showed debugging error

Hi pay now button was working perfectly just when I wanted to launch the site I found it to be not working. I disable mail chimp as I read from the last thread that an email Plugin is causing the issue unfortunately not only that didn’t work but showed debugging error in the Plugin settings page. I did the same for rave by flutterwave which I found out it was the genius you who develop it still that same issue. Help me please