dyld: dyld_sim not compatible mach-o
I had the same problem and found out that the architectures and valid architectures settings for my targets (and pods) were set wrong. iOS 11 doesn't support 32bit applications anymore, so I guess that took part in my problem..,
I've deleted my architectures + valid architectures settings (made it default) and now it compiles and runs fine in both simulator and iOS 11 device. hope it helps u as well ;).