RS 2019.5 issues

Gpe

Is there anyone with this issue ?

Functional RS system with external axis does not work after restart of controller or RS,

error message :

RobotStudio .NET exception: Unexpectedly failed to calculate mechanism position.

============================================
Base exception: InvalidOperationException
Unexpectedly failed to calculate mechanism position.
   at RobotStudio.Services.Controller.VcManager.CalculateMechanismPosition(RsIrc5Controller irc5ctrl, String[] mechUnitNames)
   at RobotStudio.Services.Controller.VcManager.IsBaseFrameUpdatedInternal(RsIrc5Controller irc5ctrl, Mechanism mechanism)
   at RobotStudio.Services.Controller.VcManager.IsBaseFrameUpdated(RsIrc5Controller irc5ctrl, Mechanism mechanism)
   at ABBInternal.Controller.StationVcMapper.HandleBaseFrameDifference(RsMechanicalUnit mechUnit, RsIrc5Controller irc5Controller)
   at ABBInternal.Controller.StationVcMapper.RemapVCMechanicalUnitToStation(MechUnitInfo vcMechUnitInfo, RsIrc5Controller irc5Controller, RobBaseFrameType vcBaseFrameType, Boolean bCheckBaseFrame, List`1 oldMechUnitList)
   at ABBInternal.Controller.StationVcMapper.<PostRestartHandling>d__18.MoveNext()