Android Studio export existing project to gitlab

I have project on Android Studio and i want to export to gitlab. So at first create a private repository. And i show this;

Command line instructions

Existing folder or Git repository

cd existing_folder
git init
git remote add origin
git add .
git commit
git push -u origin master

I was open android stuido and step by step to do this;

  1. VCS > Enable version control integration and select Git.
  2. Open the terminal window on bottom directory is my project directory.
  3. git init > Reinitialized existing Git repository
  4. git remote add origin mygiturl
  5. git add .
  6. git commit (And i show more lines to commit finish with 755, 1 Bot
  7. git push -u origin master > I show this message:
    error: src refspec master does not match any.
    error: failed to push some refs to ‘mygiturl’

How i can solve this problem?