Undefined symbols for architecture x86_64 "_OBJC_CLASS_$_BEBase64"

Hi Guru,

I got an error message while I follow the tutorial in my XCode7.1 with iOS9.1. The error is listed as below:
Undefined symbols for architecture x86_64:
OBJC_CLASS$_BEBase64” referenced from
objc-class-ref in backendless.a(MessagingService.o)
objc-class-ref in backendless.a(OfflineModeManager.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker comnmand failed with exit code 1

could you help? Thanks !

Please update CommLibiOS.a

Dear Sir,

Yes. It works now. Thanks.