Error after a fresh install: GRPC::NotFound: 5:GetRepoPath: not a git repository

I did a fresh install of MacOS mojave, set up all the requirements for gdk, and installing gdk threw the following error:

== Seed from /Users/filipa/Documents/git/gitlab-development-kit/gitlab/db/fixtures/development/19_environments.rb
rake aborted!
Gitlab::Git::Repository::NoRepository: 5:GetRepoPath: not a git repository '/Users/filipa/Documents/git/gitlab-development-kit/repositories/@hashed/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b.git'
...
caused by:
GRPC::NotFound: 5:GetRepoPath: not a git repository '/Users/filipa/Documents/git/gitlab-development-kit/repositories/@hashed/6b/86/6b86b273ff34fce19d6b804eff5a3f5747ada4eaa22f1d49c01e52ddb7875b4b.git'
...
support/bootstrap-rails failed
make: *** [postgresql/data] Error 1

/Users/filipa/Documents/git/gitlab-development-kit/repositories/@hashed does exist.