You passed the --group flag, but this group name has already been used for this run.

The existing run is: https://dashboard.cypress.io/project/abcd/runs/1

The --group flag you passed was: foo
The --parallel flag you passed was: true

If you are trying to parallelize this run, then also pass the --parallel flag, else pass a different group name.

https://on.cypress.io/run-group-name-not-unique