Please make sure you have the correct access rights and the repository exists.
1.原因：
公钥出现问题
2.解决办法：
(1)在需要提交文件的目录内，重新设置git用户名字和邮箱
git config --global user.name "yourname" #yourname你设置的名字
git config --global user.email "[email protected]" #你的邮箱 
(2)生成密钥
ssh-keygen -t rsa -C "[email protected]" #填写设置的邮箱
#回车出现：
Generating public/private rsa key pair.
Enter file in which to save the key (/c/Users/yz/.ssh/id_rsa): #请按下回车
Enter passphrase (empty for no passphrase): #回车
Enter same passphrase again: #回车
#出现Your public key has been saved in /c/Users/yz/.ssh/id_rsa.pub 表示成功，公钥保存在/c/Users/yz/.ssh/id_rsa.pub
#复制id_rsa.pub内的公钥 (3)打开
github，进入设置
点击左侧的 SSH and GPG keys，新建ssh key，将刚才复制公钥粘贴，然后点击添加即可。