What is Excel #Ref! Error and How to Avoid it

The Excel #Ref! error means there is an unknown reference or address in a cell formula.

There are times where you want to copy and paste cells (ctrl+c) vs. cutting  and paste(ctrl+x). One problem with cutting is that you can create #REF! to an existing formula.

To see this, enter into:
A1 the number 1
A2 =A1+1
Cut A3 and paste to A1
A2 = #REF!

Instead Copy A3 and paste to A1.
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