Update app.py

app.py

@@ -30,7 +30,7 @@ def gradientj_api_call(
     response = requests.post(url, headers=headers, data=json.dumps(data))
     
     if response.status_code == 200:
-        return response.json['result']
+        return response.json()['result']
     else:
         error = response.text
         return error