Creating Pages deployment failed

HttpError: Invalid deployment branch and no branch protection rules set in the environment. Deployments are only allowed from mdbook-publish at /home/runner/work/_actions/actions/deploy-pages/v2/node_modules/@octokit/request/dist-node/index.js:86:1 at processTicksAndRejections (node:internal/process/task_queues:96:5) at createPagesDeployment (/home/runner/work/_actions/actions/deploy-pages/v2/src/internal/api-client.js:126:1) at Deployment.create (/home/runner/work/_actions/actions/deploy-pages/v2/src/internal/deployment.js:80:1) at main (/home/runner/work/_actions/actions/deploy-pages/v2/src/index.js:30:1)

Error: Failed to create deployment (status: 400) with build version e156dd2ca9380e7c19ce34cdce20a150ba26f09b. Responded with: Invalid deployment branch and no branch protection rules set in the environment. Deployments are only allowed from mdbook-publish