Running Line of code twice causes activeX error 0x8000ffff

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Following code causes an ActiveX error 0x8000ffff if executed twice.

It all boils down to this two lines, as the rest of the code runs smoothly. In particular, if I run the line of code only once, it works great. If I run the line of code twice I get the error. Note that the line is only reading the variable, so I do not understand why it would not be readable the second time. If s_Var changes, then it works, essentially i can read every column once.

This works:

         obj_Dlr = GetDataLoggerRecipe(s_Dlr)
         If Not s_Var = "" Then

            Debug.Print obj_Dlr.GetColumn(s_Var).Name

         End If

This not:

         obj_Dlr = GetDataLoggerRecipe(s_Dlr)
         If Not s_Var = "" Then

            Debug.Print obj_Dlr.GetColumn(s_Var).Name
            Debug.Print obj_Dlr.GetColumn(s_Var).Name

         End If

Also reassigning the variable does not work..

         obj_Dlr = GetDataLoggerRecipe(s_Dlr)
         If Not s_Var = "" Then

            Debug.Print obj_Dlr.GetColumn(s_Var).Name

         End If

         obj_Dlr = GetDataLoggerRecipe(s_Dlr)
         If Not s_Var = "" Then

            Debug.Print obj_Dlr.GetColumn(s_Var).Name

         End If

I'm interested in understanding what is going on, as it helps me to solve anotehr problem.

Thanks

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