I had the same problem, but I figured it out. You might be working in a serverless space of Databricks, so you don't have the option to create a cluster. To fix the compute issue, create a new notebook. After that, look at the right of your screen after "Run all" and click the "connect" to connect to the serverless space. You will be connected to the Environment version. Once that is done, you will not need to create a cluster to compute.
