I can't build signed apk from react-native app while using react-native-image-picker

Actually my app is running on the android studio simulator but when I want to run this very app on my device for testing with node server it gets interrupted with this error:

Could not connect to development server

So I decided to build signed .apk (My app is ready to release) and I generated key in android studio and started building the app while my node serve was running and this error appeared

Error:Execution failed for task ':react-native-image-picker:processReleaseResources'.

java.io.IOException: Could not delete path 'D:\files\project\judge_mean\node_modules\react-native-image-picker\android\build\generated\source\r\release\android\support\v7'.

and when my node server is off , App created successfully but when I open the app it doesn't run anyway

via Hamidreza Noruzinejad