problem with push notifications

Hello , I am trying to implement push notifications but I’m having 2 errors:

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 command failed with exit code 1 (use -v to see invocation)
I am using the reference file

https://drive.google.com/file/d/0B3yyaWhA4ib0OHQ3R3Jod05QdTg/view

I appreciate the help already

Did you download the SDK from our website? github? or used cocoapods? How long ago was that?

I downloaded the SDK site . This going to 2 hours.

Do you want me to post the project to analyze ?

No, it is not necessary yet. Could you please try updating the following lib in your project (we suspect the zip on the site may be faulty):

https://github.com/Backendless/ios-SDK/blob/master/SDK/lib/CommLibiOS/CommLibiOS.a

Please let me know if it fixed the problem.

Thanks,
Mark

Hello , actually replacing the sdk Everything worked . Appreciate your help.
tks