Column to indicate whether predecessor tasks are complete


I'm looking for a way to add a set of formulas on a sheet that can work together to produce a checkbox showing whether a task's predecessors have been completed.

Based on another post I saw, I have gotten to the point of having a column that identifies a row's successors, but can't figure out the formula for the next column.

I am getting #UNPARSEABLE with that formula:

=COUNTIFS(Successors:Successors, HAS(@cell, Rownum@row), [% Complete]:[% Complete], OR(ISBLANK(@cell), @cell < 1)) = 0

What can I do to make this formula work? Thank you!



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