TypeError: null is not an object

[davepaiva]

env
os: macOS 10.15.7
mobile device : Motorolla power one, running stock android10
react-native-blob-util version: 0.13.7
react-native: 0.61.5

AndroidManifest.xml

...
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
....
<application
    ...
    android:requestLegacyExternalStorage="true"
>
...

code

import ReactNativeBlobUtil from 'react-native-blob-util'


const tempImageUri = await ReactNativeBlobUtil.config({ fileCache: true }).fetch(`${image_url}`)

error

TypeError : null is not an object (evaluating 'ReactNativeBlobUtil.DocumentDir')

Any idea where I might be going wrong?

[GuilhermeBergamoBR]

Same thing here, any progress?

[RonRadtke]

are you using expo or a plain simple react-native project?

[GuilhermeBergamoBR]

It is an expo based project, but I already ejected

[davepaiva]

are you using expo or a plain simple react-native project?

in my case this is not an expo project, it is a plain simple react-native project

[imranMnts]

@RonRadtke Do we have any update?
I have the same issue and I'm using it in a React native CLI 0.63.4 project

[RonRadtke]

Sadly not. So far I am still failing in reproducing the problem on my devices / machines.
Using it myself with RN 63.3 in production, so I doubt it's the RN version...
It's also working fine on a new project for me

Could you please try to run a gradlew clean and also clean npm modules / reinstall them?

It sounds like something is off when trying to load the reacht-native-blob-util.

[RonRadtke]

I actually managed to get this error now once too.
But I could find any reason for it. Resetting the build caches and reinstalling the NPM modules solved it for me.

[arunim2405]

@RonRadtke I am still facing this issue, reinstalling node_modules did not work for me, even tried npm start -- --reset-cache

[DonBranson]

@RonRadtke I am still facing this issue, reinstalling node_modules did not work for me, even tried npm start -- --reset-cache

I was facing this problem with RN65, redux-persist-filesystem-storage 4.0.0, which uses react-native-blob-util 0.13.12. Manually removing 0.13.12 and yarn add react-native-blob-util installed 0.13.16, which fixed this problem for me.

[RonRadtke]

I fixed sth that could cause it, so probably you got that fix now.
I'm glad it's now working for you

[anujmpec]

I am facing issue in it "react-native-blob-util": "^0.13.16",
inside "react-native-pdf": "^6.4.0",
"react-native": "0.63.4",

[ahmed-ismail-nt]

This package is a dependency of redux-persist-filesystem-storage. Force upgrading the nested dependency to 0.13.17 allowed the app to start without errors.

Thank you!

Edit: This is based on the advice above that version 0.13.16 resolves the problem. I just went ahead with the latest version instead ;)

[CoreyBovalina]

I'm also having the same issue with react-native-pdf 6.4 since they switch to react-native-blob-util from rn-fetch-blob. Any way to fix this? I've added the latest react-native-blob-util and still broke.

[ahmed-ismail-nt]

@CoreyBovalina If you're using yarn then can you try this?

1. Add this to package.json

    "resolutions": {
        "react-native-blob-util": "0.13.17"
    },

2. Add react-native-blob-util@0.13.17 as a dependency
3. Delete node_modules and run yarn install again

[CoreyBovalina]

"react-native-blob-util": "0.13.17"

in addition to doing having it as an added package as well?

when I tried doing this and it didn't fix it before: yarn add react-native-pdf react-native-blob-util fbjs

[CoreyBovalina]

ok I tried with what you said and I get this:
error: Error: Unable to resolve module react-native-blob-util from /Users/Corey/Code/aaa/qqq/node_modules/react-native-pdf/index.js: react-native-blob-util could not be found within the project or in these directories: node_modules/react-native-pdf/node_modules node_modules ../node_modules

[aaron-dsilva-opsfuse]

Facing this issues on react native: "0.66.1"
react-native-blob-util: "0.13.17".
Not working on ios

[RonRadtke]

• Delete node_modules folder (or make sure to delete rn-ftech-blob)
• Install react-native-blob-util as a standard dependency for your project
  That's all, it should work. It sounds like your app is trying to find the library within of react-native-pdf. But there it won't be installed

[silverax]

Got the same issue here, I'm trying to use react-native-pdf.
I tried adding direct dependencies to react-native-blob-util versions .16, .17 and .18 to no avail

[SzymonGlab]

Same problem, updated react-native-pdf to newest version and according to their docs I installed react-native-blob-util - version 0.13.18.

Android works fine but on iOS I get this error mentioned in the question:
TypeError: null is not an object (evaluating 'ReactNativeBlobUtil.DocumentDir').

edit: Problem disappeared after updating RN to 0.67.1

[chadzxrex]

For those who still face this issue, make sure you have linked the library in Podfile, and run npx pod-install again after linking it.
pod 'react-native-blob-util', :path => '../node_modules/react-native-blob-util'

[yingwei1025]

Facing this same issues on
react native: "0.68.2"
react-native-pdf: "6.5.0",
react-native-blob-util: "0.13.18".
expo: "45.0.0"

how to make it work on expo

[RonRadtke]

Facing this same issues on react native: "0.68.2" react-native-pdf: "6.5.0", react-native-blob-util: "0.13.18". expo: "45.0.0"

how to make it work on expo

You would have to eject your project since we are using native components