ISTA-D 4.39.20 fails to start

[BMWX5]

I found a logfile, which is generated after executing TestAutomation.exe:

2024-04-13 18:14:51.642 WARNING [T] ISTA: [1] TestAutomation.Main() - Configuration is missing.
2024-04-13 18:14:51.705 ERROR [T] ISTA: [1] TestAutomation.Main() - failed with exception: System.ArgumentException: Ein leerer Pfad ist unzulässig. (~ empty path is not valid)
  bei System.IO.File.ReadAllText(String path)
  bei TestAutomation.Services.JsonReaderService.GetJson(String path)
  bei TestAutomation.Services.ConfigurationService..ctor(JsonReaderService jsonReaderService, String simulationConfigurationPath)
  bei TestAutomation.Actions.ActionHandler..ctor(String simulationConfigurationPath)
  bei TestAutomation.Program.Main(String[] args)

Where do have I configure which path?