# Ray : ModuleNotFoundError coupled with Serialization issue

**URL:** <https://discuss.ray.io/t/ray-modulenotfounderror-coupled-with-serialization-issue/4469>\
**Category:** Ray Core\
**Created:** [December 17, 2021, 2:40am UTC](https://discuss.ray.io/t/ray-modulenotfounderror-coupled-with-serialization-issue/4469 "2021-12-17T02:40:27Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![lihost](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/lihost/32/1896_2.png) [@lihost](https://discuss.ray.io/u/lihost)\
**Post date:** [December 17, 2021, 2:40am UTC](https://discuss.ray.io/t/ray-modulenotfounderror-coupled-with-serialization-issue/4469/1 "2021-12-17T02:40:27Z")

</div>

Hi Team,

Another ModuleNotFoundError coupled with Serialization issue.

Here is code structure -

1. CounterUser.py

```auto
#CounterUser.py

from Counter import Counter
import ray
from CounterUtil import CounterUtil

ray.init(address='ray://127.0.0.1:10001')

class Consume:
    def __init__ (self, val) -> None:
        self.counter_actor = Counter.remote(val)

    def consume_counter(self, val):
        fut = self.counter_actor.increment.remote(val)
        resp = ray.get(fut)
        return resp

if __name__ == " __main__":
    num=5
    consumer = Consume(num)
    resp = consumer.consume_counter(1)
    print("got reponse as", resp)

```

1. Counter.py

```auto
# Counter.py

import ray
from CounterUtil import num_dict

@ray.remote
class Counter(object):
    def __init__ (self, val):
        ## Model is loaded here, instead of val
        self.value = val

    def increment(self, inc_by):
        self.value += inc_by
        return self.value

    def get_counter(self):
        return self.value

```

Above demo code works but when I try to fit this into working project, with Counter.py having a model loaded(instead of `self.value = val`) then I am getting this error.

Here is what traceback look like…

```auto
(TemporaryActor pid=52997) 2021-12-16 18:09:23,125	ERROR serialization.py:283 -- No module named 'src'
(TemporaryActor pid=52997) Traceback (most recent call last):
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 281, in deserialize_objects
(TemporaryActor pid=52997) obj = self._deserialize_object(data, metadata, object_ref)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 194, in _deserialize_object
(TemporaryActor pid=52997) return self._deserialize_msgpack_data(data, metadata_fields)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 172, in _deserialize_msgpack_data
(TemporaryActor pid=52997) python_objects = self._deserialize_pickle5_data(pickle5_data)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 162, in _deserialize_pickle5_data
(TemporaryActor pid=52997) obj = pickle.loads(in_band)
(TemporaryActor pid=52997) ModuleNotFoundError: No module named 'src'
[2021-12-16 18:09:25,568] ERROR in app: Exception on /api/v2/handler/inspect [POST]
Traceback (most recent call last):
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/flask/app.py", line 2070, in wsgi_app
    response = self.full_dispatch_request()
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/flask/app.py", line 1515, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/flask/app.py", line 1513, in full_dispatch_request
    rv = self.dispatch_request()
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/flask/app.py", line 1499, in dispatch_request
    return self.ensure_sync(self.view_functions[rule.endpoint])(**req.view_args)
    
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/_private/client_mode_hook.py", line 104, in wrapper
    return getattr(ray, func. __name__ )(*args, **kwargs)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/util/client/api.py", line 42, in get
    return self.worker.get(vals, timeout=timeout)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/util/client/worker.py", line 359, in get
    res = self._get(to_get, op_timeout)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/util/client/worker.py", line 386, in _get
    raise err
ray.exceptions.RayActorError: The actor died because of an error raised in its creation task, ray::Title. __init__ () (pid=52997, ip=127.0.0.1)
  At least one of the input arguments for this task could not be computed:
ray.exceptions.RaySystemError: System error: No module named 'src'
traceback: Traceback (most recent call last):
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 281, in deserialize_objects
    obj = self._deserialize_object(data, metadata, object_ref)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 194, in _deserialize_object
    return self._deserialize_msgpack_data(data, metadata_fields)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 172, in _deserialize_msgpack_data
    python_objects = self._deserialize_pickle5_data(pickle5_data)
  File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 162, in _deserialize_pickle5_data
    obj = pickle.loads(in_band)
ModuleNotFoundError: No module named 'src'
(TemporaryActor pid=52997) 2021-12-16 18:09:25,554	ERROR worker.py:431 -- Exception raised in creation task: The actor died because of an error raised in its creation task, ray::Name. __init__ () (pid=52997, ip=127.0.0.1)
(TemporaryActor pid=52997) At least one of the input arguments for this task could not be computed:
(TemporaryActor pid=52997) ray.exceptions.RaySystemError: System error: No module named 'src'
(TemporaryActor pid=52997) traceback: Traceback (most recent call last):
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 281, in deserialize_objects
(TemporaryActor pid=52997) obj = self._deserialize_object(data, metadata, object_ref)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 194, in _deserialize_object
(TemporaryActor pid=52997) return self._deserialize_msgpack_data(data, metadata_fields)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 172, in _deserialize_msgpack_data
(TemporaryActor pid=52997) python_objects = self._deserialize_pickle5_data(pickle5_data)
(TemporaryActor pid=52997) File "/Users/macpro/anaconda3/envs/demo3.9.7/lib/python3.9/site-packages/ray/serialization.py", line 162, in _deserialize_pickle5_data
(TemporaryActor pid=52997) obj = pickle.loads(in_band)
(TemporaryActor pid=52997) ModuleNotFoundError: No module named 'src

```

---

<div class="post-metadata">

**Author:** ![Clark\_Zinzow](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.ray.io/clark_zinzow/32/445_2.png) [@Clark\_Zinzow](https://discuss.ray.io/u/Clark_Zinzow)\
**Post date:** [January 6, 2022, 9:06pm UTC](https://discuss.ray.io/t/ray-modulenotfounderror-coupled-with-serialization-issue/4469/2 "2022-01-06T21:06:32Z")

</div>

Hi @lihost, it looks like this might be an issue with your `src` package being accessible to the actor, i.e. that `src` package needs to be available on the node that the actor runs on. Have you checked out our docs on handling dependencies? [Handling Dependencies — Ray v2.0.0.dev0](https://docs.ray.io/en/master/handling-dependencies.html)