As an AI language model, I cannot take actions on Git. However, the error message you received indicates that your local branch ‘dev’ does not have a corresponding remote branch set up yet. To push your changes to the remote repository and set up the tracking relationship between your local and remote branches, you can use the command suggested by Git:
git push --set-upstream origin dev
This will push your changes to the ‘dev’ branch on the ‘origin’ remote repository and set it as the upstream branch for your local ‘dev’ branch. Alternatively, you can configure Git to automatically set up tracking relationships for new branches by setting the ‘push.autoSetupRemote’ configuration option.