noting it here so we keep knowledge of this issue.
it looks like gitlab does some strict checks for repositories. And, as can be seen in hpc-team/gridengine#1 we now have a repo that gets caught with something gitlab thinks is an error. I expect we will see more of it, as its pretty clear where its from: A hastily (and as such badly) done conversion from subversion to git.
The upstream issue to this is https://gitlab.com/gitlab-org/gitlab-ce/issues/21912 - but its ignored for about a year by now, so unsure how quickly it will get a fix. (A switch to ignore certain "errors" would be nice.