Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://sandbox.zenodo.org/api/iiif/record:188992/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://sandbox.zenodo.org/api/iiif/record:188992/canvas/drystar-2-1024x1024.jpg",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f136bd82-b959-45fd-81dd-22f766ec443e",
      "cw-6566eaa8-e409-4478-80de-d45673744d00"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "window-dd31a984-60b6-4331-876f-f46e11abfa7c",
    "manifestId": "https://sandbox.zenodo.org/api/iiif/record:188992/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-6566eaa8-e409-4478-80de-d45673744d00",
    "thumbnailNavigationPosition": "far-right",
    "visibleCanvases": []
  }
}