Adding a Package breaks the Build

I created a React Native App. I have Android SDK 23 installed as prescribed, ran react-native init myapp then react-native start and react-native run-android.

Everything works perfect.

Now I wanted to add a Module: https://github.com/react-native-community/react-native-linear-gradient

I did as it is described there. npm install react-native-linear-gradient --save and then react-native link. When I now want to run react-native start and react-native run-android I get:

 ERROR  EPERM: operation not permitted, lstat 
'C:\Users\User\Documents\myapp\android\app\build\generated\source\r\debug\android\support\v7'
{"errno":-4048,"code":"EPERM","syscall":"lstat","path":"C:\\Users\\User\\Documents\\myapp\\android\\app\\build\\generated\\source\\r\\debug\\android\\support\\v7"}
Error: EPERM: operation not permitted, lstat 'C:\Users\User\Documents\myapp\android\app\build\generated\source\r\debug\android\support\v7'

I have also tried the manual way but again the same mistake. I have my terminal run as administrator so I don't know why he can't delete the path..

via user5417542