Can't edit cell

D

DRLski

I'm trying to just add a simple formula to a cell in Excel
"=sum(A1,I1)" but unfortunately it seems to keep coming back with an
error:

"Cell contains a Formula. Cannot Modify. Must Select Cancel."

I tried searching for this error but I came up empty. Anyone have any
ideas on what I am doing wrong?

Thank you,
Dave
 
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