git fetch --all抛出错误错误：无法锁定ref'

Question

iam尝试执行git fetch时-都会在下面引发错误

     error: cannot lock ref 'refs/remotes/origin/brnach': ref refs/remotes/origin/brnach is at abce2e3830ec7e372ea31d0ac2630f26263c1f2 but expected 125cfre76395580bcedaa082a85c1c38b8fsd174
       From http:/someurl/git/project
      ! 035sf4f65...d7bfdfbf0d brnach   -> origin/brnach  (unable to update local ref)
        + 3d24353...feefbab Prep-2     -> origin/Prep-2  (forced update)
         error: Could not fetch origin