# GitLab Contribution Problem
**URL:** https://discuss.tryton.org/t/gitlab-contribution-problem/6992
**Category:** Developer
**Created:** [February 15, 2024, 9:35pm UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992 "2024-02-15T21:35:41Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Hulala](https://discuss.tryton.org/u/Hulala)
#### Post date: [February 15, 2024, 9:35pm UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/1 "2024-02-15T21:35:41Z")
Hello everyone,
I think I’m having trouble trying to contribute to GitLab.
Could someone tell me how should I contribute the code?
- I am a customer of using Github and I think the way is to create a new Issue, then branch it and end with a PR.
When I try to create a new branch, I get the error message: “Failed to create branch ‘xxxxxxxxxxx’: invalid reference name ‘branch/default’”.
The hg between git is a headache. 🥶
Do we have any guide available for this?
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 15, 2024, 11:08pm UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/2 "2024-02-15T23:08:35Z")
> [@Hulala](#):
>
> Do we have any guide available for this?
Yes: [Tryton - How to Develop](https://www.tryton.org/develop#submit-change)
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### Author:  [@Hulala](https://discuss.tryton.org/u/Hulala)
#### Post date: [February 16, 2024, 10:14am UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/4 "2024-02-16T10:14:41Z")
Sure Ced,
But I am not able to create a new Branch to create a new PR to be able to work and contribute.
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 16, 2024, 10:15am UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/5 "2024-02-16T10:15:34Z")
Because the workflow is not based on branches but topics.
See [Merge Request Quick Start Guide](https://heptapod.net/pages/quick-start-guide.html)
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [February 16, 2024, 11:42am UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/6 "2024-02-16T11:42:02Z")
Indeed we forbid contributors to create branches, only maintainer can do that because in mercurial branches are eternal not like in git. Indeed mercurial topic is a closer concept to git branch than the mercurial branch.
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### Author:  [@Hulala](https://discuss.tryton.org/u/Hulala)
#### Post date: [February 16, 2024, 11:55am UTC](https://discuss.tryton.org/t/gitlab-contribution-problem/6992/7 "2024-02-16T11:55:04Z")
Fine Ced,
I will try it, I think I have not the topic set right at hg.