How to make bot from shoter game sample attack character from other asset such as ironbelly fps character?

Hi, i am developing my own fps game. For now i am stuck with the enemy AI so i decided to use enemy bot from the shhoter game sample. But the problem is that when i put it into my game it does not attack the player character because i am using fps character from ironbelly studios. Well i tried to edit a behaiviour by replacing one command “cast to first person character” (i mean character from the shooter game) and i tried to replace it with "cast to first person character desert eagle " (that one is from ironbelly studios. Unfortunetly my atempt to do this was unsuccesful. Also i am the beginer in working with ue4. So if you can anwser my question try to explain really simple to me to make me understand. And also i would be very happy if you send me some screenshots with examples. Thanks, i will be waiting for your anwsers.