Unsure if this issue is related to snow leopard, but this build does work on a machine running Lion, but that might not be the only difference.
I have xcode 4.2 with the ios 6.1 simulator.
I am getting a pretty generic error that is blocking my development "cannot compile data model for path [path to momd file]"
Here is the full error log:
DataModelVersionCompile /.../Xcode/DerivedData/MyApp-abcdefg/Build/Products/Debug-iphonesimulator/MyApp.app/MyApp.momd /.../MyApp.xcdatamodeld setenv PATH /Developer/usr/bin/momc -XD_MOMC_SDKROOT=/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk -XD_MOMC_IOS_TARGET_VERSION=6.1 -MOMC_PLATFORMS iphonesimulator -MOMC_PLATFORMS iphoneos -XD_MOMC_TARGET_VERSION=10.6 /.../Debug-iphonesimulator/MyApp.app/MyApp.momd
dyld: Library not loaded: /usr/lib/system/libdispatch.dylib
Referenced from: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/usr/lib/libSystem.dylib Reason: no suitable image found. Did find: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator6.1.sdk/usr/lib/system/libdispatch.dylib: unknown required load command 0x80000023 2013-06-01 17:14:40.374 momc[72001:607] * -[NSKeyedUnarchiver initForReadingWithData:]: data is empty; did you forget to send -finishEncoding to the NSKeyedArchiver? /.../MyApp.xcdatamodeld:0: error: Compilation failed for data model at path '/.../Debug-iphonesimulator/MyApp.app/MyApp.momd/MyApp.mom'
Thanks for your help!
