Can I assume that you used Build.exe to compile for iOS Device 64-bit and then just added the dcu directory to your library path for iOS Simulator ARM 64-bit?
Because that most likely won't work (although that error message from the compiler is not at all helpful)
Support for iOS Simulator ARM 64-bit was missing from Build.exe - you have two options (well three, but I always discourage people from doing the third one, that is: adding the source directory of the spring units you need to your project):
- open the project group and add the target platform for the Sim to the packages you need units from and build them, then fix the library path for the Sim platform to use the iOSSimARM64 folder (not the iOSDevice64 one, remove it if you previously added it)
- wait until I fix it and get the latest commit from the develop branch (probably later today or tomorrow)