Workday formula getting an unparseable error


I am trying to calculate the end dates of some milestones. I have a start date column, planned duration column, and end date column. I have holidays in a separate sheet called holiday idle days. Im using the formula below but there seems to be an error with it. Can anyone advise?

=WORKDAY([@row]Start Date, [@row]Planned Duration,{Holiday Idle Days Range 2})



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