Getting error when cloning

[richard-steiger]

Here's the console trace:
$ git clone https://github.com/gabriele-tomassetti/antlr-mega-tutorial.git
Cloning into 'antlr-mega-tutorial'...
remote: Enumerating objects: 271, done.
remote: Counting objects: 100% (155/155), done.
remote: Compressing objects: 100% (75/75), done.
fatal: --stdin requires a git repository
fatal: fetch-pack: invalid index-pack output

To be explicit, no clone is produced.