While clicking on select image not opening camera

Ionic Framework ionic-v3
1

at the time of uploading image I am getting error-> class not found…
how do I know whick class
the actual llink is…
https://devdactic.com/ionic-2-images/

 this.camera.getPicture(options).then((imagePath) => {
      // Special handling for Android library
      if (this.platform.is('android') && sourceType === this.camera.PictureSourceType.PHOTOLIBRARY) {
        this.filePath.resolveNativePath(imagePath)
          .then(filePath => {
            let correctPath = filePath.substr(0, filePath.lastIndexOf('/') + 1);
            let currentName = imagePath.substring(imagePath.lastIndexOf('/') + 1, imagePath.lastIndexOf('?'));
            this.copyFileToLocalDir(correctPath, currentName, this.createFileName());
          });
      } else {
        var currentName = imagePath.substr(imagePath.lastIndexOf('/') + 1);
        var correctPath = imagePath.substr(0, imagePath.lastIndexOf('/') + 1);
        this.copyFileToLocalDir(correctPath, currentName, this.createFileName());
      }
    }, (err) => {
      this.presentToast(err);
    });
2

And what is the error?
Where and how are you testing?

3

in below code error is class not found

(err) => {
      this.presentToast(err);
    });