git 是不是克我, 服了

git branch
* 'front-end-controller'
'master'
'plain_way'

显示我有 master, 但是切换不过去,
{lamb} git checkout master
error: pathspec 'master' did not match any file(s) known to git.

{lamb} git branch -d master
error: branch 'master' not found.

{lamb} git branch --set-upstream-to=origin/master 'front-end-controller'
error: the requested upstream branch 'origin/master' does not exist


通过网页查看, 我也有 master 分支, 我真服了