推送报错“GitLab: You are not allowed to acce?报错

我用的是TortoiseGit，以前一直用的好好的，能正常提交和推送，今天更新了一个自己的开源项目，推送时报错，信息如下：

git.exe push -v --progress  "origin" master:master

Pushing to git@git.oschina.net:calvinwilliams/G5.git
Counting objects: 31, done.
Delta compression using up to 2 threads.
Compressing objects: 100% (16/16), done.
Writing objects: 100% (16/16), 16.13 KiB | 0 bytes/s, done.
Total 16 (delta 12), reused 0 (delta 0)
remote: GitLab: You are not allowed to access master!
remote: error: hook declined to update refs/heads/master
To git@git.oschina.net:calvinwilliams/G5.git
! [remote rejected] master -> master (hook declined)
error: failed to push some refs to 'git@git.oschina.net:calvinwilliams/G5.git'

git不能完全退出(退出码 1) (5594 ms @ 2014-06-11 21:12:54)

请问如何解决？