Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://sandbox.zenodo.org/api/iiif/record:139844/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://sandbox.zenodo.org/api/iiif/record:139844/canvas/3Asset-10%404x-1024x1002.png",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-220cc69a-7e16-46b4-bf65-e5f666150128",
      "cw-83b6073f-e0a2-484e-be07-da415b72d542"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "window-3b329531-6a1e-46ac-bd7b-db795045c5dd",
    "manifestId": "https://sandbox.zenodo.org/api/iiif/record:139844/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-83b6073f-e0a2-484e-be07-da415b72d542",
    "thumbnailNavigationPosition": "far-right",
    "visibleCanvases": []
  }
}