Couldn't install Mean.Js app using Yo generator

[graphpixel]

kaiss@GraphPixel-Executive:/var/www/app$ yo meanjs
You're using the official MEAN.JS generator.
? What mean.js version would you like to generate? 0.4.0
0.4.0
? In which folder would you like the project to be generated? This can be
changed later. .
Cloning the MEAN repo.......
Error: Command failed: git clone --branch v0.4.0 https://github.com/meanjs/mean.git .
Cloning into '.'...
/var/www/app/.git: Permission denied

Versions:
Node.JS: v6.11.0
NPM: v3.10.10

[SpiesInOrbit]

Looks like a file permission issue. Do you have write access to "/var/www/app"?
Try a simple create with touch.
app $ touch testfile.txt

if you get "touch: cannot touch ‘textfile.txt’: Permission denied" its definitely a permission issue

[lirantal]

due to high maintenance required on the generator we don't officially maintain it anymore.
I suggest cloning the official mean.js repo's master branch and starting from that point.