Onesignal plugin with ios platform issue

I got this error while trying to sudo ionic cordova platform add ios !

Osamas-MBP:DawaeyApp osama$ sudo ionic cordova platform add ios --save
> cordova platform add ios --save
✖ Running command - failed!

[ERROR] Cordova encountered an error.
        You may get more insight by running the Cordova command above directly.

[ERROR] An error occurred while running cordova platform add ios --save (exit code 1):

        Using cordova-fetch for cordova-ios@~4.4.0
        Adding ios project...
        Creating Cordova project for the iOS platform:
        Path: platforms/ios
        Package: com.dawaey
        Name: Dawaey
        iOS project created with cordova-ios@4.4.0
        Installing "onesignal-cordova-plugin" for ios
        Failed to install 'onesignal-cordova-plugin': undefined
        Error: /Library/Ruby/Gems/2.0.0/gems/claide-1.0.2/lib/claide/command.rb:439:in `help!': [!] You cannot run
        CocoaPods as root. (CLAide::Help)

        Usage:

        $ pod COMMAND

        CocoaPods, the Cocoa library package manager.

        Commands:

        + cache      Manipulate the CocoaPods cache
        + env        Display pod environment
        + init       Generate a Podfile for the current directory
        + install    Install project dependencies according to versions from a
        Podfile.lock
        + ipc        Inter-process communication
        + lib        Develop pods
        + list       List pods
        + outdated   Show outdated project dependencies
        + repo       Manage spec-repositories
        + setup      Setup the CocoaPods environment
        + spec       Manage pod specs
        + update     Update outdated project dependencies and create new Podfile.lock

        Options:

        --silent     Show nothing
        --version    Show the version of the tool
        --verbose    Show more debugging information
        --no-ansi    Show output without ANSI codes
        --help       Show help banner of specified command
        from /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.1/lib/cocoapods/command.rb:47:in `run'
        from /Library/Ruby/Gems/2.0.0/gems/cocoapods-1.1.1/bin/pod:55:in `<top (required)>'
        from /usr/local/bin/pod:23:in `load'
        from /usr/local/bin/pod:23:in `<main>'