Thanks Alex.
I want to get the last value from a custom data class by "token" method.
But in 1st run, since it is no value in the class and make this error.
My custom token is :
SELECT [LastRun_Date] FROM [dbo].[Inv_run_record]
WHERE [_ResourceGuid] = '%COMPUTERID%'
Since your suggested custom token is too complicated for me. I don't know how to translate it to my situation.
Would you give some hints to do that?
Thank you very much.