I tried
=AVERAGE(Jeff!C2,Blaze!C2,Hunter!C2,Alexia!C2)
=AVERAGE(Jeff:Alexia!C2)
Those names are sheet names and the formula is in cell C2 in the master sheet called 'FINAL SCORE'.
Error is
This value doesn't match the data validation restrictions defined for
this cell.
I need a formula or macro that to take the value in the same cell 'C2' in each sheet, and give me the average. C2 can only have numbers 0 through 10 (I locked this on each sheet).
This would then be replicated for each cell contiguously so same formula for D2, E2, F2 etc. (to aggregate scoring in a final column which I already have a working formula for.
Screenshot of Final Score sheet layout - every sheet looks identical except the other sheets have numbers ranging from 0-10 in C2

I am working on a project to rank anime that a group of friends watch to provide ranking/recommendations to each other.