Gitscrum - Client authentication failed due to unknown client

I’m trying to connect Gitscrum to my self-hosted (from source) instances of Gitlab but I get this error:

An error has occurred

Client authentication failed due to unknown client,
no client authentication included,
or unsupported authentication method.

Using my account I get this


My Box install:

System information
System:		Ubuntu 16.04
Proxy:		no
Current User:	git
Using RVM:	no
Ruby Version:	2.4.5p335
Gem Version:
Bundler Version:1.17.1
Rake Version:	12.3.1
Redis Version:	5.0.3
Git Version:	2.20.1
Sidekiq Version:5.2.3
Go Version:	go1.10.5 linux/amd64

GitLab information
Version:	11.6.0-rc8-ee
Revision:	da6280f8aee
Directory:	/home/git/gitlab
DB Adapter:	postgresql
DB Version:	9.5.14
URL:		https://gitlab.[domain].com
HTTP Clone URL:	https://gitlab.[domain].com/some-group/some-project.git
SSH Clone URL:	git@gitlab.[domain].com:some-group/some-project.git
Elasticsearch:	no
Geo:		no
Using LDAP:	no
Using Omniauth:	yes
Omniauth Providers: 

GitLab Shell
Version:	8.4.3
Repository storage paths:
- default: 	/home/git/repositories
Hooks:		/home/git/gitlab-shell/hooks
Git:		/usr/bin/git

I have the same problem. Now I try to fix this problem but not success.

Do you have a solution for solve this problem?