I have narrowed down the error to your line of code with:
\Stripe\Charge::create();
I've scoured the web and your code looks correct, so I can only assume you may need to update your Stripe installation on the server.
I added debug code to help you see and debug the error. If you comment out line 62 you will see your error, but with line 62 the line runs, so that means the code with the error is on line 63.