Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://iiif.quartexcollections.com/qstarter29/iiif/308b374f-6ec8-48c0-9d67-dd7af4d283a9/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9e8925c2-0dc5-4429-950c-b75ef7163fa0",
      "cw-4e2df355-3b07-4939-a805-5e11eefb1363"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-981d22f8-0047-4a3a-a4cc-0edd94890c2b",
    "manifestId": "https://iiif.quartexcollections.com/qstarter29/iiif/308b374f-6ec8-48c0-9d67-dd7af4d283a9/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4e2df355-3b07-4939-a805-5e11eefb1363",
    "thumbnailNavigationPosition": "far-bottom"
  }
}