「找错人了！」英文怎么说？

bark up the wrong tree 

找错人了、选错了人选、选错了目标

Stop bothering me ! I have no idea where he is. You are barking up the wrong tree. 

别来烦我，我不清楚他在哪，你问错人了。

Hey boy ! Calm down ! Don't give me attitude ! Do you think I care ? You are barking up the wrong tree. 

Hey ! 年轻人，放轻松点，别跟我耍脾气，你觉得我会在乎吗 ？那你可真是挑错人了。