"API Error Message: The object is no longer valid." What's causing this error?

Hi,

I've had this error occur a few times today.

API Error Message: The object is no longer valid.

Does anyone know what I'm doing wrong to cause this error?

The LastError.txt file contains the following,

Int64 MdlModelRefP(): The object is no longer valid.
0: at Bentley.Interop.MicroStationDGN.ModelReference.MdlModelRefP()
1: at MicEctEcad.NETMicEctEcad.clsTagCache.Clear()
2: at MicEctEcad.NETMicEctEcad.Header.WorkingSetHelper.SetWorkingModelReference(ModelReference model)
3: at ECT.ECAD.API.DrawingTool.UpdateTitleBlockVariables(Page pg, Boolean needDefaultModel)
4: at ECT.ECAD.API.Page.RefreshAll(Boolean isForOpen)
5: at ECT.ECAD.API.Utility.RefreshActivePageNoCheck(Boolean bForOpen)
6: at ECT.ECAD.API.Page.Open(Boolean readOnly)
7: at ECT.ECAD.API.CommandProcessor.ExecutePageCommand(Command val)
8: at ECT.ECAD.API.CommandProcessor.Execute(Command val)
9: at ECT.ECAD.API.CommandProcessor.Execute(Commands val)

Kind regards,

DM

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