human
Solve the following python programming problem given the following code:
def input_schema(schema) : 
    def upper_wrapper(fn) : 
        def inner_wrapper(self, * args, **kwargs) : 
            request_data = request.get_json () 
            if (not request_data) : 
                return make_simple_error_output ('Request body must be a valid JSON', 415) 
(data, err) = schema.load (request_data) 
            if err : 
                return make_marshmallow_error_output (err) 
return fn (self, data, * args, ** kwargs) 
return inner_wrapper 
return schema 

    
    

    Fix the buggy line: return schema
assistant
#Here is Python program to fix the buggy line: return schema
.

return def upper_wrapper(