Packaging from Git

[Narcis Garcia <debianlists@actiu.net>]

Hello, I'm trying to maintain a small project in my public Git, and to
have an easy way to build a package for Debian OS obtaining a good/clean
result.
After this, I will try to deploy my APT repository or contact some
sponsor for Debian official repository.

I'm executing this but I don't identify the problem:

$ cd /tmp
$ rm -fr ntfsundelete-tree
$ export GIT_SSL_NO_VERIFY=1
$ git clone https://git.actiu.net/libre/ntfsundelete-tree
$ cd ntfsundelete-tree
$ git-buildpackage
gbp:error: upstream/1.0.0 is not a valid treeish

Can the Git content be bad? Lack of files? Unnecessary files? Bad structure?

Thanks.
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