Hi @Kaniz Fatma​! By new cluster specification, do you mean creating a new cluster using a json file? In the tutorial, this code was what we needed to run in the notebook:

mlflow run <uri> -b databricks --backend-config <json-new-cluster-spec>

so for the <json-new-cluster-spec>, what I have for that code is this: Would this be the new cluster specification?

(Also, the company's databricks I'm using has internet restriction, and I'm not sure if that would factor into this error, but if it does, I would love to have an explanation!)

Thank you so much!!