Fix GitLab error: “you are not allowed to push code to protected branches on this project”?

I have a problem when I push my codes to git while I have developer access in my project, but everything is okay when I have master access. Where is the problem come from? And how to fix it?

Error message:

error: You are not allowed to push code to protected branches on this project.
…
error: failed to push some refs to …