Facing admin while opening from netlify deployed link

hi everyone
i implementing eleventy with netlify cms
but when i open the netlify generated link it’s showing error in config file while opening adim

backend:
name: git-gateway
branch: master

media_folder: "_site/images/uploads"
public_folder: "/images/uploads"

collections:
  - name: "posts"
    label: "Posts"
    folder: "posts"
    slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
    fields:
      - {
          label: "Layout",
          name: "layout",
          widget: "hidden",
          default: "layouts/post.njk",
        }
      - { label: "Title", name: "title", widget: "string" }
      - { label: "Description", name: "description", widget: "string" }
      - { label: "Date", name: "date", widget: "date", default: "" }
      - { label: "Post Body", name: "body", widget: "markdown" }
      - { label: "Featured Image", name: "featuredImage", widget: "image" }

can anyone pls help me out

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