When a dog being used to hunt raccoons, a dog will bark up at a tree ("up a tree") to indicate that a raccoon is within the tree's branches.
If a dog is barking up the wrong tree, the dog is making a serious mistake.
Example: Lisa: "Dave, I thought I saw you in the lounge earlier. When I went into the lounge afterwards, there was coffee spilled all over the table." Dave: "It wasn't me! You're barking up the wrong tree. I was having a sandwich at my desk while I was working on the September report. You must've mistaken me for someone else."
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