How do I fix `CommError, Run does not exist` during a sweep?

If you see both CommError, Run does not exist and ERROR Error uploading during a sweep, the most likely cause is that you are setting a run ID manually in your code:

wandb.init(id="some-string")

You can not set a run ID for W&B Sweeps because W&B automatically generates random, unique IDs for runs created by sweeps. Run IDs must be unique within a project.

To fix this, remove the id parameter from wandb.init(). If you want to set a custom name that appears on tables and graphs, use the name parameter instead:

wandb.init(name="a helpful readable run name")

For more information, see Sweeps troubleshooting.

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Sweeps Runs