Git cannot copy files

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Hello,
I created a test project as follows:

ssh://git@172.20.2.57:22/hack3rcon/test.git
http://172.20.2.57/hack3rcon/test.git

I ran the following commands on my system:

$ git init
$ git remote add origin git@172.20.2.57:hack3rcon/test.git
$ git add .
$ git commit -m "Initial commit"
$ git push -u origin master

But I got the following error:

error: src refspec master does not match any
error: failed to push some refs to '172.20.2.57:hack3rcon/test.git'

What is wrong?

Thank you.