Error on first execution of npm-start

[abjrcode]

Following the sample code listed on the launch event of Create React Native App.

Doing npm-start and immediately getting 'yarn' is not recognized as an internal or external command, operable program or batch file.

I know how to fix this of-course, but the question is it expected and is yarn a known dependency because I can't see it mentioned in the installation script ?

At the same time, the process continues but can't open the app with the QR code. It is just stuck :(

[anp]

Can you paste the full error output please?

[abjrcode]

That is is the full error output. I then see the QR and that the dev server is running on some port but can't load it in the app on the phone.

I see the error right after the the line Starting packager

I am running on Windows 10 with only Node installed.

Update:
I was able to get the app running after noticing that it wasn't on the same local network as the phone, which poses another question. If you have 2 network interfaces, how do you make the dev server run on one or the other without disabling any of them ?

Although I got the app running, it stopped on the phone after like 10 seconds (weird).
Running on a wireless network with the publish profile. Network discovery and file sharing is disabled. Don't know it is related but thought of sharing.

Node version: v6.10.0
NPM version: 3.10.10

[anp]

Interesting. If you update react-native-scripts to at least 0.0.23, you can specify the REACT_NATIVE_PACKAGER_HOSTNAME to provide a specific IP address.

To answer your previous question: create-react-native-app defaults to yarn, but it is not a hard dependency. Earlier versions of the init script would print the "can't find yarn" message before continuing with npm, but that should no longer be the case as long as you update create-react-native-app itself.

Giving this a close since it sounds like the underlying issues have been resolved. If you run into more networking problems, please open issues for them!

[abjrcode]

Unfortunately updating the package to the latest version didn't help. Actually it made things worse.
I can't run the app at all now, I get a red screen after 5 mins on mobile phone with all kinds of errors.

Plus I still see the yarn packager problem.

[anp]

Unfortunately it's very difficult to troubleshoot "all kinds of errors." If you can take some screenshots of the errors you're seeing, I'd be happy to help.

[abjrcode]

I know this is not very helpful for diagnosing the problem, but the thing is I don't know what the problem is.
I have installed the latest version of create-react-native-app again. I still get the message about yarn again.
Trying to open the application with the mobile phone times out, it just doesn't work.
If there any info or logs I can provide to help diagnose this then please let me know and I will be happy to provide.

[anp]

The message about yarn is an issue with upstream React Native, and will be resolved soon hopefully.

The timeouts sound like a networking issue, have you tried the steps in the user guide for troubleshooting that?

[abjrcode]

All right. I didn't know about that section :(
Thanks a lot for the help 👍
I will check it.

[abjrcode]

The mobile phone and the laptop are indeed on the same network.
Can't access the both HTTP URLs from the mobile phone though, although they are accessible from the browser on the machine itself.
Adding firewall rules for those two ports is not helping :)

Will try a few more things but I am running of out of ideas :(

Kind regards,