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I solved this.
This error doesn't relate to cellEditorDoc.Save Event Handlers
This error invoke because there are a errors in the cell (incorrect pin count and placed pins, incorrect count of overall pins and so on). In this case Cell Editor invoke error mesagge such this:
Because there is no needed Event Handler for this errror invokes following exception:
Error:0x800402f4 'When executing this operation a condition requiring user input was encountered. Please supply a handler for the OnCellModifyConfirmation event so that you can provide it.'
P.S. cellEditorDoc.Save andcellEditorDoc.Close(True) may be used without attached events and in this situation it will not invoke any exceptions or errors