Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://zenodo.org/api/iiif/record:974965/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://zenodo.org/api/iiif/record:974965/canvas/big_77057.jpg",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-4229064d-2a79-46e0-89b3-c2bb39876863",
      "cw-0c1ef2a6-c5df-46cd-be81-71885de1b1b3"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "window-94546377-3fb1-4d07-97fd-ba68ea12b9ad",
    "manifestId": "https://zenodo.org/api/iiif/record:974965/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0c1ef2a6-c5df-46cd-be81-71885de1b1b3",
    "thumbnailNavigationPosition": "far-right",
    "visibleCanvases": []
  }
}