Ionic 2 - Getting error TS2304 Cannot find name 'CameraPage'

i have been working on a project that would require the usage of the device camera.I wrote a class call camera where it will use the device camera and i am trying to call the function takePicture() from camera.ts and use it in my home.ts 's button.However i am faced with the above mention error on home.ts. Below are the codes , any help would be greatly appreciated as i just started learning ionic 2 not long ago

home.ts

via GX-X