GIT提交报错，是什么意思呢？

Question

git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree commit -q -F /var/folders/c1/1l_k0nkj5zl0f26qll1p40sm0000gn/T/SourceTreeTemp.DTlcFH 


git -c diff.mnemonicprefix=false -c core.quotepath=false -c credential.helper=sourcetree push -v --set-upstream origin refs/heads/Dev:refs/heads/Dev 

2018-01-03 11:28:28.359 git-credential-sourcetree[7881:213624] Error (internetKeychainItemForServer:withUsername:path:port:protocol:) - The specified item could not be found in the keychain.
To https:**********.git（这里是我隐藏的Git地址）
 ! [rejected]        Dev -> Dev (non-fast-forward)
error: failed to push some refs to 'https:**********.git（这里是我隐藏的Git地址）'
hint: Updates were rejected because the tip of your current branch is behind
hint: its remote counterpart. Integrate the remote changes (e.g.
hint: 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.
Completed with errors, see above

这是什么错啊，不能提交啊？

Answer 1

你当前分支落后了，先pull一下，再提交。

hint: 'git pull ...') before pushing again. //看这句

Answer 2

.....别的电脑修改了然后已经提交，你换了台电脑修改在提交....当然提交不上去....本地仓库跟远程仓库冲突，先把远程仓库的更新跟你本地的同步了，在提交。

Answer 3

先pull 再说