我正在尝试推送最新的本地更改，但出现错误。

! [rejected]        dev -> dev (non-fast-forward)
error: failed to push some refs to 'https://******************.git'
hint: Updates were rejected because a pushed branch tip is behind its remote
hint: counterpart. Check out this branch and integrate the remote changes
hint: (e.g. 'git pull ...') before pushing again.
hint: See the 'Note about fast-forwards' in 'git push --help' for details.

我所做的

• git pull

始终返回Already up to date.。

• git reset --hard

返回HEAD is now at ****** COMMITNAME。正确。

• git fetch和git merge

呼叫git merge时传回fatal: No current branch.。
我想做的
我下面要做的只是。

git add .
git commit -m ""
git push origin dev

现在，git push origin dev就是问题所在。
我不知道该怎么办。有人知道解决办法吗？