Any ideas on "received message with not supported version (null)"?

I’m trying to setup an external package that also has an example app that can be built/ reloaded while developing the package. I was trying to crib react-navigation’s setup for this as much as possible, where they have an examples folder under the top-level folder, and then each example can be run with CRNA, with a “link” in packages.json to supply the reference to the react-navigation library.

Everything mostly works, except, every time I change the code, I get a ABI27_0_0RCTPackagerConnection received message with not supported version (null) error in the Expo app. When I refresh, then my code reloads just fine (until I change the code again).

I don’t have a great way to reproduce this error for someone else to run at this point (it’s a library for internal use). I’m basically just curious if anyone can offer any insight as to why this error might occur and what I can try to resolve. I’ve tried clearing the cache, rm -rf node_modules. I’ve also switched between Expo and CRNA (doesn’t make a difference, so I don’t think this is CRNA-specific). I tried following React Navigation’s ( instructions for running their example apps, and I don’t get the error, so something must be different, but I can’t see a difference.

Here’s the full error:

ABI27_0_0RCTPackagerConnection received message with not supported version (null)

-[ABI27_0_0RCTPackagerConnection reconnectingWebSocket:didReceiveMessage:]
-[ABI27_0_0RCTReconnectingWebSocket webSocket:didReceiveMessage:]
__42-[ABI27_0_0RCTSRWebSocket _handleMessage:]_block_invoke

Here’s my app.json

  "expo": {
    "name": "some-name-of-app",
    "description": "This project is really great.",
    "slug": "some-name-of-app",
    "privacy": "unlisted",
    "sdkVersion": "27.0.0",
    "platforms": ["ios", "android"],
    "version": "1.0.0",
    "orientation": "portrait",
    "icon": "./assets/icon.png",
    "entryPoint": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
    "splash": {
      "image": "./assets/splash.png",
      "resizeMode": "contain",
      "backgroundColor": "#ffffff"
    "updates": {
      "fallbackToCacheTimeout": 0
    "assetBundlePatterns": [
    "ios": {
      "supportsTablet": true

and my package.json

  "name": "some-name-of-app",
  "version": "1.0.0",
  "description": "",
  "author": "",
  "main": "./node_modules/react-native-scripts/build/bin/crna-entry.js",
  "private": true,
  "scripts": {
    "start": "react-native-scripts start"
  "dependencies": {
    "react": "16.3.1",
    "expo": "^27.0.0",
    "react-native": "^0.55.0",
    "my-package-under-development": "link:../.."
  "devDependencies": {
    "babel-plugin-module-resolver": "^3.1.0",
    "jest": "^22.1.3",
    "jest-expo": "^26.0.0",
    "react-native-scripts": "^1.5.0"
  "jest": {
    "preset": "jest-expo",
    "moduleFileExtensions": [
    "modulePathIgnorePatterns": [
    "transformIgnorePatterns": [

You could maybe try starting with one of react-navigation’s examples and modifying it progressively to make it your own?

Thanks; yeah, I’ll have to try that when I get a chance. It’ll take me a while, so was just curious if anyone was familiar with that error, or perhaps was even familiar with what version number it is talking about.

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