Update app.py

app.py

@@ -57,7 +57,7 @@ def generate_image(prompt):
             user_app_id=userDataObject,
             model_id=MODEL_ID_IMG,
             version_id=MODEL_VERSION_ID_IMG,
-            inputs=[resources_pb2.Input(data=resources_pb2.Data(text=resources_pb2.Text(raw=prompt, size= '512x512')))]
+            inputs=[resources_pb2.Input(data=resources_pb2.Data(text=resources_pb2.Text(raw=prompt, size= (512,512))))]
         ),
         metadata=metadata
     )