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#ask-community
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# ask-community
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Amir Jaber

01/31/2023, 4:36 PM
Hi everyone. I am working my way through the tutorial. Whenever I run
dagster dev -f cereal.py
I get the following error message. At the same time, I am not able to navigate to http://127.0.0.1:3000/ I am currently on this page of the tutorial: https://docs.dagster.io/tutorial/assets/defining-an-asset Does anyone know what might be happening here?
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daniel

01/31/2023, 5:39 PM
Hi Amir, here's how a previous user resolved the msizes thing within VSCode: https://dagster.slack.com/archives/C01U954MEER/p1671369474024709?thread_ts=1670866987.341699&cid=C01U954MEER
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Amir Jaber

02/02/2023, 10:02 AM
Hi @daniel. Thanks for sending that across. To give an update, in case anyone else runs into the same issue as me, here’s how we managed to resolve it: My .py files are in a subfolder in my repo, so I needed to specify the relative path: e.g
dagster dev -f *dagster/*cereal.py
Also, prefixing the command with sudo was needed (perhaps due to being on an M1 Mac?). The full command that worked for me is thus:
sudo dagster dev -f dagster*/*cereal.py