React Native Error - yarn' is not recognized as an internal or external command
I faced the same issue and it got resolved by below command
npm install -g yarn
you have to install yarn globally in your windows OS type this in CMD
npm install -g yarn
you can check yarn version by typing yarn --version
on CMD
You should probably insert your Yarn folder in your Environment Variables.
If you already performed the command
npm install -g yarn
and still can't use yarn via terminal, check the following folder: C:\Users\[your user]\AppData\Roaming\npm
If there`s a yarn file there, just put that directory in your Path variable.
Yarn is a tool created by facebook as an efficient alternative for npm. In your case.. it is just informing that Yarn is not installed in your system. It is not the culprit.
The problem lies in Error occurred during initialization of VM java/lang/NoClassDefFoundError: java/lang/Object Could not install the app on the device
line. It looks like an error with the Java installation.
Solution: Go to C:\Windows\System32
directory and delete java.exe
(or rename it to something like java.exe.old
)
refer this answer for more details https://stackoverflow.com/a/30577609/5597641.
btw you can install Yarn by typing npm install -g yarn
in your command prompt.