Troubleshooting a gallery block error in a page builder

Uncaught Error: Invalid item type: "[object Object]". Default array input can only contain objects (for now)

export default {
  title: "Gallery",
  name: "gallery",
  type: "object",
  fields: [
    {
      name: "image",
      title: "Image",
      type: "array",
      of: [{ type: "galleryImage" }],
    },
  ],
}

export default {
  name: "galleryImage",
  type: "object",
  title: "Gallery Image",
  fields: [
    { name: "caption", type: "string", title: "Caption" },
    { name: "mainImage", type: "image", title: "Image" },
  ],
}

export default {
  name: "pageBuilder",
  type: "array",
  title: "Content",
  of: [
    {
      name: "header",
      type: "header",
      title: "Header",
    },
    {
      name: "landingHeader",
      type: "landingHeader",
      title: "Landing Header",
    },
    {
      name: "images",
      type: "galleryImage",
      title: "Gallery",
    },
  ],
}