GetDVHCumulativeData for PlanUncertainty fails

[mfizyczka]

I'm getting this error while trying to get DVH Cumulative data for PlanUncertainty with ESAPI. At the same time it is working with pyESAPI. Disabling the function does not help.

var uncDvh = uncertaintyIonPlan.GetDVHCumulativeData(structure, DoseValuePresentation.Absolute, VolumePresentation.Relative, 0.1);