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ERROR: Collection was modified; enumeration operation may not execute.

In 2 weeks time, the daily schedule failed twice:

both times, very quickly, 

Error info below, but I don't understand what the issue is since this table does not change ?

-> on the table:

Nav_Option_Detailed Vendor Ledg. Entry.Document Type 

(this table only contains 2 fields: option value (int) and option text (nvarchar(80))

 

Start Time : 6/10/2019 2:02:56 End Time : 6/10/2019 2:02:59 on server: xxx
-Execute Execution Package 01.Update Data STAGE 'Failed'
        Collection was modified; enumeration operation may not execute.

Details:
       
        Collection was modified; enumeration operation may not execute.
        Module: mscorlib
        System.InvalidOperationException
           at System.ThrowHelper.ThrowInvalidOperationException(ExceptionResource resource)
           at System.Collections.Generic.List`1.Enumerator.MoveNextRare()
           at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
           at TimeXtender.DataManager.Project.get_CurrentEnvironment()
           at TimeXtender.DataManager.Project.Folder()
           at TimeXtender.DataManager.StepTransferSSISExecute.DoStage(StepSetup stepSetup, VariableResolveObject dynamicResolveObject)
           at TimeXtender.DataManager.StepTransferSSISExecute.DoAbstractStep(StepSetup stepSetup)
       
Execute Business Unit Business Unit:Info:Initialized
  -Execute Business Unit Business Unit
Execute JetNavStage:Info:Initialized
    -Execute JetNavStage
Execute Table JetNavStage dbo.Date:Info:Initialized
Execute Table JetNavStage dbo.Closing Entry:Info:Initialized
Execute Table JetNavStage dbo.Date Aggregation:Info:Initialized
Execute Table JetNavStage dbo.Date Calculation:Info:Initialized
Execute Table JetNavStage dbo.Date Comparison:Info:Initialized
Execute Table JetNavStage dbo.Open:Info:Initialized
Execute Table JetNavStage dbo.CompanyBM:Info:Initialized
Execute Table JetNavStage dbo.Nav_Option_Detailed Vendor Ledg. Entry.Document Type:Info:Initialized
      -Execute Table JetNavStage dbo.Nav_Option_Detailed Vendor Ledg. Entry.Document Type
Execute JetNavStage dbo.Nav_Option_Detailed Vendor Ledg. Entry.Document Type SSIS Transfer:Error:Failed
        -Execute JetNavStage dbo.Nav_Option_Detailed Vendor Ledg. Entry.Document Type SSIS Transfer 'Failed'
         Collection was modified; enumeration operation may not execute.

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