as for me, this problem about the PATH. because the sh can't find the script in specifed PATHS.
you should add the npm global script path to your PATH variable.
if you are using "Git Bash", run the below command.
PATH=$PATH:/c/Users/CHANGE_WITH_YOUR_USERNAME/AppData/Roaming/npm
notice that, this is temporary. when you close the git bash, the PATH variable will be deleted.
for the permanently, you have to create a .bashrc file in your home folder.
run these commands on your git bash.
cd ~
echo PATH=$PATH:/c/Users/CHANGE_WITH_YOUR_USERNAME/AppData/Roaming/npm >> .bashrc
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