Why does the application not start after installing the module on react native?

Question

JavaScript

Hello. I installed the react native device info module to find out the id of the android device. But on startup it gives an error. Registered links through react-native link react-native-device-info. After unlink also does not start.

C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainActivity.java:3: error: package com.facebook.react does not exist
import com.facebook.react.ReactActivity;
                         ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainActivity.java:5: error: cannot find symbol
public class MainActivity extends ReactActivity {
                                  ^
  symbol: class ReactActivity
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:6: error: package com.facebook.react does not exist
import com.facebook.react.ReactApplication;
                         ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:7: error: package com.facebook.react does not exist
import com.facebook.react.ReactInstanceManager;
                         ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:8: error: package com.facebook.react does not exist
import com.facebook.react.ReactNativeHost;
                         ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:9: error: package com.facebook.react does not exist
import com.facebook.react.ReactPackage;
                         ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:10: error: package com.facebook.react.shell does not exist
import com.facebook.react.shell.MainReactPackage;
                               ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:15: error: cannot find symbol
public class MainApplication extends Application implements ReactApplication {
                                                            ^
  symbol: class ReactApplication
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:17: error: cannot find symbol
  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
                ^
  symbol:   class ReactNativeHost
  location: class MainApplication
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:30: error: cannot find symbol
  public ReactNativeHost getReactNativeHost() {
         ^
  symbol:   class ReactNativeHost
  location: class MainApplication
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainActivity.java:11: error: method does not override or implement a method from a supertype
    @Override
    ^
C:\apps\react\showdriver\android\app\src\main\java\com\showdriver\MainApplication.java:17: error: cannot find symbol
  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
                                                       ^
  symbol:   class ReactNativeHost
  location: class MainApplication
12 errors
:app:compileDebugJavaWithJavac FAILED

Answer 1

Try the command in the console:
then
react-native link

Answer 2

The most probable error is failures at an automatic link. RNPM works well, but not always, so it's best to go through the manual installation instructions for this kind of error (when connecting new modules) - https://github.com/rebeccahughes/react-native-devi...
If that doesn't work , roll back to a running version and install this module completely manually, it should help.