Hi @DataBeli ,

Check below thread. Most probably you're hitting an issue that was described in following paragraph:

Solved: Can not create a Streamlit Databricks App on free ... - Databricks Community - 138044

• There has been a recent service-side issue seen by the Apps on-call team where app creation fails during the internal “create_compute_resources” step and surfaces exactly this error message; one root cause was a regional backend failure (gatekeeper not returning a cluster tier for certain Free/Pharos workspaces). In those windows, delete-and-retry won’t help until the region recovers.

I guess you can try once again tomorrow. According to the user who started above thread it started to work next day.