can`t able to create the branch via API

I am using GitLab CE, 9.3.6

I tried to create the branch by API. It is working for all other project but when I come for sfrichtextribbon-wpf if showing below error. What is the problem, Why it is happening for that project alone?

My curl comment

--request POST --header "PRIVATE-TOKEN:token" "https://gitlab.company.com/api/v4/projects/667/repository/branches?branch=release/Releasetest&ref=development"

I got below result

{"message":"/var/opt/gitlab/git-data/repositories/essential-studio/sfrichtextribbon-wpf.git/hooks/pre-receive:3: warning: Insecure world writable dir /opt/gitlab in PATH, mode 040777\n"}