Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://iiif.quartexcollections.com/imb/iiif/854893c7-222d-4a23-af5e-0d0b7727ab0b/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7db1dfa9-29e3-4c3d-a78d-152560af47e7",
      "cw-481c6919-15b2-4e19-8fb4-ce139593c7fe"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-df9687ad-fcd2-4928-af67-e3789195d1ed",
    "manifestId": "https://iiif.quartexcollections.com/imb/iiif/854893c7-222d-4a23-af5e-0d0b7727ab0b/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-481c6919-15b2-4e19-8fb4-ce139593c7fe",
    "thumbnailNavigationPosition": "far-bottom"
  }
}