I was running an ionic app successfully, but when i upgraded to iOS10.3.1 and Xcode 8.3.1 then whenever i create a new project and build it
i get the error 

```
<Cordova/CDVViewController.h> file not found

```

How to fix this. How to downgrade to lower versions.

```
Cordova CLI: 6.5.0 
Ionic CLI Version: 2.2.1
Ionic App Lib Version: 2.2.0
iOS : 4.3.1

```