Crossword Genius

This can't be right (5)

Ross

I believe the answer is:

error

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'this can't' is the first definition.
The definition suggests a singular noun which matches the answer.

'right' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'be' is the link.

Can you help me to learn more?

(Other definitions for error that I've seen before include "Boob" , "Bug" , "Solecism" , "1 down" , "Bloomer, blunder" .)

I've seen this clue in The Globe and Mail.
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