External Beam Configuration not found

[SchindhelmR]

Hi,

we already discussed a bit concerning this script. I managed to understand it so far and adapted it to our clinical nomenclature. But unfortunately an error occurs: "External Beam configuration not found". I have seen that there was already a lot of discussion, but I havn't found a solution.
I already tried to change
"ExternalBeamMachineParameters MachineParameters =
new ExternalBeamMachineParameters(beam.TreatmentUnit.Id, beam.EnergyModeDisplayName, beam.DoseRate, beam.Technique.Id, string.Empty);"

to

"ExternalBeamMachineParameters MachineParameters =
new ExternalBeamMachineParameters(beam.TreatmentUnit.Id, beam.EnergyModeDisplayName, beam.DoseRate, beam.Technique.Id, "FFF");"

but it didn't work. Do you know where this error may stem from?

Best regards