Problem with ionic build project

From today I presented this problem and do not know where to fix it. Update the version s.o thinking that this could be the solution but nothing has happened again, I keep getting the same error.
I’m working my application in ios.

ld: 12 duplicate symbols for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)


The following build commands failed:
Ld build/emulator/ normal i386
(1 failure)
ERROR building one of the platforms: Error: /Users/lixsys/view_ios/platforms/ios/cordova/build: Command failed with exit code 65
You may not have the required environment or OS to build this project

We have the same issue; nobody knows?