AlamoFire在某些页面上没有被识别，但在其他页面上却被识别出来

I have imported AlamoFire into my project and for some reason it is now not being recognized on one of my pages. The project was working a few days ago now I'm getting the Apple Mach-O Linker error and I believe it is because I have this error after I clean and build: I have imported AlamoFire into my project and f