SQLite for Ionic returning error

I'm using Firefox and Chrome for development. I installed the sqlite plugin but there's always error when firing openDB command on:

firefox(TypeError: n.sqlitePlugin is undefined ng-cordova.min.js (line 9, col 19046))

and

chrome(Uncaught TypeError: Cannot read property 'openDatabase' of undefined ng-cordova.min.js:9ng-cordova.min.js:9)

I don't know what did I do wrong. Please help.