rails error 05

[keita@ip-172-31-28-2 toy_app]$ git add -A
[keita@ip-172-31-28-2 toy_app]$ git commit -m "修正"
[master 18f8fa6] 修正
[keita@ip-172-31-28-2 toy_app]$ git remote add origin https://github.com/keita03301995/toy_app.git
fatal: remote origin already exists.
[keita@ip-172-31-28-2 toy_app]$ git push -u origin master
Username for 'https://github.com': keita03301995
Password for 'https://keita03301995@github.com': 
Counting objects: 145, done.
Compressing objects: 100% (129/129), done.
Writing objects: 100% (145/145), 28.44 KiB | 0 bytes/s, done.
Total 145 (delta 27), reused 0 (delta 0)
To https://github.com/keita03301995/sample_app.git
   637b1f8..18f8fa6  master -> master
Branch master set up to track remote branch master from origin.