Redmine

Im using Git only.

I was able to successfully create two repositories on my project in redmine.
Soon, I deleted both of them from the project because I decided to move/change the local folder structure.

When I went back to try to recreate one of the repositories on the same project, it now says:
"Identifier is invalid"

No matter what I put in the identifier field, it says that the identifier is invalid.
I have tried different identifiers and different paths.

I am able to create and delete repositories in other projects.

Whats the issue... defect??

Log:

Started GET "/projects/development/repositories/new" for 127.0.0.1 at 2015-04-10 12:36:56 -0700
Processing by RepositoriesController#new as HTML
  Parameters: {"project_id"=>"development"}
  Current user: James H (id=3)
  Rendered repositories/_form.html.erb (3.0ms)
  Rendered repositories/new.html.erb within layouts/base (3.0ms)
Completed 200 OK in 36ms (Views: 25.0ms | ActiveRecord: 7.0ms)
Started POST "/projects/development/repositories" for 127.0.0.1 at 2015-04-10 12:37:06 -0700
Processing by RepositoriesController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"[token here]", "repository_scm"=>"Git", "repository"=>{"is_default"=>"1", "identifier"=>"Dev_Development", "url"=>"C:\\redmine\\repositories\\dev-development.git", "path_encoding"=>"UTF-8", "extra_report_last_commit"=>"0"}, "commit"=>"Create", "project_id"=>"development"}
  Current user: James H (id=3)
  Rendered repositories/_form.html.erb (2.0ms)
  Rendered repositories/new.html.erb within layouts/base (3.0ms)
Completed 200 OK in 39ms (Views: 26.0ms | ActiveRecord: 3.0ms)