# Cannot run sandbox.py for some reason?

**URL:** https://forum.theavr.org/t/cannot-run-sandbox-py-for-some-reason/297
**Category:** AVR Drone Software
**Created:** [October 27, 2022, 12:39am UTC](https://forum.theavr.org/t/cannot-run-sandbox-py-for-some-reason/297 "2022-10-27T00:39:27Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Ag3ntOran6e](https://avatars.discourse-cdn.com/v4/letter/a/ecae2f/32.png) [@Ag3ntOran6e](https://forum.theavr.org/u/Ag3ntOran6e)
#### Post date: [October 27, 2022, 12:39am UTC](https://forum.theavr.org/t/cannot-run-sandbox-py-for-some-reason/297/1 "2022-10-27T00:39:27Z")

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Hello,

its saying when trying to run just the sandbox portion of the code that it cannot find the bell module, even though using pip it looks like its installed. Any ideas?

Thanks in advance!

 ![IMG_7400](https://canada1.discourse-cdn.com/flex007/uploads/avr/original/1X/b56bf37ca1d7df0d91a6b0dfb36706fe197dd5ba.jpeg)

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### Author: ![nathan](https://yyz1.discourse-cdn.com/flex007/user_avatar/forum.theavr.org/nathan/32/4_2.png) [@nathan](https://forum.theavr.org/u/nathan)
#### Post date: [October 31, 2022, 4:07pm UTC](https://forum.theavr.org/t/cannot-run-sandbox-py-for-some-reason/297/2 "2022-10-31T16:07:58Z")

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Sorry I didn’t see this earlier. You’re using the Bell library, but there are a few dependencies that are optional. In your `requirements.txt` file for the Sandbox module, change the line to be:

`bell-avr-libraries[mqtt,serial]==0.1.9`

to include the optional serial dependencies.