[Android] undefined is not an object (evaluating 'RNFetchBlob.DocumentDir')

[dphov]

Hello!

This error appears at start launch in the simulator/device.

In my example I'm trying implement this part of code, how we can avoid this issue?

Thank you in advance.

componentDidMount() { RNFetchBlob .config({ // add this option that makes response data to be stored as a file, // this is much more performant. fileCache : true, }) .fetch('GET', 'https://homepages.cae.wisc.edu/~ece533/images/mountain.png') .then((res) => { // the temp file path console.log('The file saved to ', res.path('/')) }) requestPermission("android.permission.ACCESS_FINE_LOCATION").then((result) => { console.log("Granted!", result);// now you can set the listenner to watch the user geo location }, (result) => { console.log("Not Granted!"); console.log(result); });

react-native@0.29.0
react-native-cli@1.0.0
react@15.2.0
react-native-fetch-blob@0.6.3-dev.1

[wkh237]

Hi @dphov , It looks like your package is not linked properly, did you restart your packager after install the package ? the module has many native code so you have to rebuild the project after install it.

[dphov]

Hi @wkh237 ,

1. I'm has restarted packager
2. Ran npm install
3. Then ran rnpm link

And I got the same error

[wkh237]

Did you save the package dependency to package.json ? rnpm does not work if the package could not be found in package.json.

could you try the following commands ?

$ npm install --save react-native-fetch-blog@0.6.3-dev.1
$ rnpm link react-native-fetch-blob
$ react-native run-android

[dphov]

package.json after running commands
"dependencies": { "react": "15.2.0", "react-native": "0.29.0", "react-native-android-permissions": "^0.0.6", "react-native-cli": "^1.0.0", "react-native-fetch-blob": "^0.6.3-dev.1", "undefined": "^0.1.0" }

got same error again

[wkh237]

This may also related to changes in 0.29 , could you check MainApplication.java in /android/app/src/main/java/com/<project name>t/MainApplication.java, see if the RNFetchBlobPackage is added into package list ?

 @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
          // Add this line if it does not exists
+         new RNFetchBlobPackage()                                                                                                                
      );
    }

Add the missing package and compile to see if it work 👍

[wkh237]

• Add 0.29 instruction to README.md
• Change rnpm link script

[dphov]

Hurray! It works! Thank you!

[wkh237]

That's great 👍 Please feel free file an issue if something's going wrong 😄

[dphov]

Sure! 😄 👍