E {PKG Installer} LDR: Not a PKG File!

I want to install game in rpcs3. but, when im select the .PKG files and going to install it. Small windows appear says "Another installation found. Do you want to overwrite it?" I don't know what happen, im never installed this game. it's my first time using rpcs3. When i click on "yes" button, Red collored messages appear on the log box. it says " E {PKG Installer} LDR: Not a PKG File!"

If you know the answer please help. and sorry for bad english