Formula Variance Help

Good Afternoon. I am looking to set a Baseline Start and End date; however, I have several Phases that I would like to include to capture the change in phases. (i.e., prospecting how many days we have prospected a client and when the transition to implementation goes live. Etc. Is there a way to capture the movement in phases with the below formula as I keep getting the return of #UNPARSEABLE

Thank you!

=IFERROR(NETWORKDAYS([Actual Finish Date]@row, [Baseline Finish Date]@row), "Prospecting")


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