我在服务器上学习git，我创建了一个名为test的git存储库，并在其中进行了两次提交。现在，我通过命令git clone file:///home/username/test test2将此存储库克隆到名为test2的/ home / username中，然后创建test2存储库作为测试存储库的克隆。
现在我在test2存储库中进行了一次新的提交，并尝试通过命令git push -u origin master将其推送到原点，现在这会出现以下错误
Counting objects: 3, done.
Delta compression using up to 4 threads.
Compressing objects: 100% (2/2), done.
Writing objects: 100% (3/3), 286 bytes | 0 bytes/s, done.
Total 3 (delta 0), reused 0 (delta 0)
remote: error: refusing to update checked out branch: refs/heads/master
remote: error: By default, updating the current branch in a non-bare repository
remote: error: is denied, because it will make the index and work tree inconsistent
remote: error: with what you pushed, and will require 'git reset --hard' to match
remote: error: the work tree to HEAD.
remote: error:
remote: error: You can set 'receive.denyCurrentBranch' configuration variable to
remote: error: 'ignore' or 'warn' in the remote repository to allow pushing into
remote: error: its current branch; however, this is not recommended unless you
remote: error: arranged to update its work tree to match what you pushed in some
remote: error: other way.
remote: error:
remote: error: To squelch this message and still keep the default behaviour, set
remote: error: 'receive.denyCurrentBranch' configuration variable to 'refuse'.
To /home/username/test/
! [remote rejected] master -> master (branch is currently checked out)
error: failed to push some refs to '/home/username/test/'
为什么会出现此错误以及如何解决此错误