Getting compile error with SDK

I’m getting this error when I try to compile on an iPhone 4s and 5 simulator but it works on an iPhone 5s,6 and 6 Plus simulator. I’m using version 2.0 of the SDK and targeting iOS8. Any help is appreciated.

Here is the error I’m getting:
Undefined symbols for architecture i386:
OBJC_CLASS$_Backendless”, referenced from:
__TMaCSo11Backendless in ViewController.o
__TMaCSo11Backendless in AppDelegate.o
__TMaCSo11Backendless in ViewController.o
__TMaCSo11Backendless in AppDelegate.o
OBJC_CLASS$_BackendlessDataQuery”, referenced from:
__TMaCSo20BackendlessDataQuery in ViewController.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)

iOS SDK 2.0 doesn’t support i386 architecture for simulators. Please use the simulators with x86_64 arch.