iMessage Framework Error

I have added a sticker pack to an exsiting app (which i have done beofre on other apps) but when i build in Xcode and then load via application loader, it says the iMessage Framework was not included and wont add my sticker pack. I have checked and it seems as if i have done everything correctly as with my previous app but it is not working. It is also crashing when i try to run the stickers on the simulators. anyone else having issues with this?