What does “be barking up the wrong tree” mean?

to have the wrong idea about how to get or achieve sth

How is “be barking up the wrong tree” used?

In Eternal Sunshine of the Spotless Mind (2004), one line is: “At least I'm not barking up the wrong tree.”

The clip at the top of this page is from Eternal Sunshine of the Spotless Mind (2004).

At least I'm not barking up the wrong tree.

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