TypeError: Cannot read property 'openDatabase' of undefined

Hello when i clone your code i have this error occurred
```
TypeError: Cannot read property 'openDatabase' of undefined
    at Object.openDB (ng-cordova.min.js:9)
    at app.js:46
    at Array.<anonymous> (ionic.bundle.js:56207)
    at onPlatformReady (ionic.bundle.js:2496)
    at onWindowLoad (ionic.bundle.js:2477)
```

Please let me know if you have solution.