git: update submodule error

Question

I am getting the following error when I am updating my sub module.

fatal: reference is not a tree: 8657febdb311a29253ef8e6a965e3c9089e36b00
Unable to checkout '8657febdb311a29253ef8e6a965e3c9089e36b00' in submodule path 'Fluent.Util'

I am kind of new to git and start using it recently. Can anyone help me with this. Let me know if you need more info.

Thanks,

Answer 1

My colleague has set up the submodule incorrectly. The above posts does help.