Redmine

I was able to install Redmine 3.1.0 on an Ubuntu server (15.04). Now, I want to integrate hgweb (Mercurial). the configuration of Apache is easy:

        PerlLoadModule Apache::Redmine
        ScriptAlias /hg  "/var/www/html/hg/hgweb.cgi" 
        <Location /hg >
            AuthType Basic
            AuthName "Redmine Mercurial Repository" 
            AuthUserFile /dev/null
            Require valid-user
            #Redmine auth
            PerlAccessHandler Apache::Authn::Redmine::access_handler
            PerlAuthenHandler Apache::Authn::Redmine::authen_handler
            RedmineDSN "DBI:mysql:database=redmine;host=localhost" 
            RedmineDbUser "redmine" 
            RedmineDbPass "redmine" 
            #RedmineCacheCredsMax 10
        </Location>

hgweb is working well if I comment out the redmine auth parts. If I try to authenticate with redmine I always get an 401 Unauthorized message.
Apache error.log:

[Wed Sep 16 17:23:47.447109 2015] [auth_basic:error] [pid 14574:tid 139847437932288] [client x.x.x.x:45706] AH01618: user transporter not found: /hg/
[Wed Sep 16 17:23:53.075982 2015] [auth_basic:error] [pid 14574:tid 139847446324992] [client x.x.x.x:45712] AH01618: user transporter not found: /hg/
[Wed Sep 16 17:23:57.296066 2015] [auth_basic:error] [pid 14574:tid 139847356380928] [client x.x.x.x:45712] AH01618: user transporter not found: /hg/
[Wed Sep 16 17:24:01.422917 2015] [auth_basic:error] [pid 14574:tid 139847347988224] [client x.x.x.x:45712] AH01618: user transporter not found: /hg/

I can login into my redmine installation with the used username and password, but it's not working over the pearl module.

I also checked a test directory with simple html files

Alias /test/ "/var/www/html/test/" 
<Directory " /var/www/html/test/">
    Order allow,deny
    Allow from all
    Require all granted
</Directory>
<Location /test >
    AuthType Basic
    AuthName "Redmine Test Portal" 
    AuthUserFile /dev/null
    Require valid-user
    PerlAccessHandler Apache::Authn::Redmine::access_handler
    PerlAuthenHandler Apache::Authn::Redmine::authen_handler
    RedmineDSN "DBI:mysql:database=redmine;host=localhost" 
    RedmineDbUser "redmine" 
    RedmineDbPass "redmine" 
    #RedmineCacheCredsMax 10
</Location>

Environment:
  Redmine version                3.1.1.stable
  Ruby version                   2.2.1-p85 (2015-02-26) [x86_64-linux]
  Rails version                  4.2.4
  Environment                    production
  Database adapter               Mysql2
SCM:
  Subversion                     1.8.10
  Mercurial                      3.1.2
  Git                            2.1.4
  Filesystem                     
Redmine plugins:
  no plugin installed

See: Apache::Redmine not working