Wrong approach to something, chose wrong issue to think about.
To make a wrong choice to talk about.
Responding to something what isn't the important.
Waste one’s efforts by pursuing the wrong thing or path
If you think you will solve the problem by this way, you are barking up the wrong tree.
I am not the person who can do that, you are barking up the wrong tree.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.