After getting the repository I get the following error:
git clone --recursive https://github.com/Polytonic/Glitter
...
error: no such remote ref 63784dab5fdf7fe84fd93f2caeef43b8524f7389
Fetched in submodule path 'Glitter/Vendor/bullet', but it did not contain 63784dab5fdf7fe84fd93f2caeef43b8524f7389. Direct fetching of that commit failed.
After getting the repository I get the following error: