error: failed to push some refs to git

error: src refspec master does not match any.
error: failed to push some refs to 'https://github.com/userid/voice.git'

solution :
1. git add -A
2. git status
3. git commit -m "message"
3.git push origin HEAD:<remoteBranch>

fatal: remote origin already exists.

fatal: remote origin already exists.

git remote add origin https://github.com/voice/voiceApp.git

solution :

1.First remove origin
cmd :  git remote rm origin

2. now add the origin
cmd : git remote add origin https://github.com/voice/voiceApp.git

or

1.set the new git  origin/remote URL
.set the new origin
cmd : git remote set-url origin https://github.com/voice/voiceApp.git

2. Now check origin.

cmd : git remote show origin

jenkins,github Failed to connect to repository

Failed to connect to repository : Command "/usr/bin/git -c core.askpass=true ls-remote -h
...
stderr: remote: Invalid username or password

problem : jenkins is trying to handshake with git with the provided credentials. but unable to login.

solution :
1) Go to jenkins homepage.

2) Go to credentials, add git user name and password.

3) Go to jenkins project, select new added credentials from the dropdown.

Failed to connect to repository : Could not init /tmp/hudson

Failed to connect to repository : Could not init /tmp/hudson

1) There's no such executable git in PATH: /sbin, /usr/sbin, /bin, /usr/bin.
In the jenkins job section.
Advanced...
Source Code Management.
got git.
2) Failed to connect to repository : Could not init /tmp/hudson

solution : please install git(as below ) or provide the git exe file path (/usr/bin/git).  

Install git on linux.

command : sudo yum install git-all

ref : https://git-scm.com/book/en/v2/Getting-Started-Installing-Git

now check the git version.
cmd : git --version