Onesignal plugin with ios platform issue

so why it's not accepting running ionic cordova platform add ios without sudo !!!?

Osamas-MacBook-Pro:DawaeyApp osama$ ionic cordova platform add ios
> 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):

        /usr/local/lib/node_modules/cordova/node_modules/configstore/index.js:54
        throw err;
        ^

        Error: EACCES: permission denied, open
        '/Users/osama/.config/configstore/cordova-config.json'
        You don't have access to this file.

        at Error (native)
        at Object.fs.openSync (fs.js:641:18)
        at Object.fs.readFileSync (fs.js:509:33)
        at Object.get
        (/usr/local/lib/node_modules/cordova/node_modules/configstore/index.js:35:26)
        at Object.Configstore
        (/usr/local/lib/node_modules/cordova/node_modules/configstore/index.js:28:44)
        at Object.<anonymous>
        (/usr/local/lib/node_modules/cordova/src/cli.js:39:12)
        at Module._compile (module.js:570:32)
        at Object.Module._extensions..js (module.js:579:10)
        at Module.load (module.js:487:32)
        at tryModuleLoad (module.js:446:12)