Cordova - Current working directory is not a Cordova-based project

I'm using phonegap for my mobile project. My question is why I got this error when I try to search phonegap plugin using cordova CLI? I run this command in terminal to search phonegap plugin

cordova plugin search bar code

Full error message

Last login: Wed Jan 22 15:04:09 on ttys000
Mohammads-MacBook-Pro:~ mohammadnurdin$ cd /Applications/MAMP/htdocs/rmbp/apps/rmbp/iphone/native
Mohammads-MacBook-Pro:native mohammadnurdin$ cordova plugin search bar code

/usr/local/lib/node_modules/cordova/src/util.js:57
            throw new Error('Current working directory is not a Cordova-based 
                  ^
Error: Current working directory is not a Cordova-based project.
    at Object.module.exports.cdProjectRoot (/usr/local/lib/node_modules/cordova/src/util.js:57:19)
    at CLI.plugin (/usr/local/lib/node_modules/cordova/src/plugin.js:28:36)
    at new CLI (/usr/local/lib/node_modules/cordova/src/cli.js:109:30)
    at Object.<anonymous> (/usr/local/lib/node_modules/cordova/bin/cordova:41:16)
    at Module._compile (module.js:456:26)
    at Object.Module._extensions..js (module.js:474:10)
    at Module.load (module.js:356:32)
    at Function.Module._load (module.js:312:12)
    at Function.Module.runMain (module.js:497:10)
    at startup (node.js:119:16)
Mohammads-MacBook-Pro:native mohammadnurdin$ 

You have to be in a project before you launch cordova plugin search bar code.