May I know exact issue?
trying to run my workflow. At the time I had this issue.
Please check below thread for Excel Lookup range activity:
whenever the activity which is necessary for a process is missing, the bot will throw “cannot create unknown type” error.
check whether your activity list is having LookUpRange activity and add/update excel package.
If process is already published, bot throws this error if the package is not available in bot local, orchestrator. so upload the package in that location.