Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://sandbox.zenodo.org/api/iiif/record:187924/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://sandbox.zenodo.org/api/iiif/record:187924/canvas/Readers+Choice+award+2019-640w.jpg",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-71536946-73f0-4389-9013-b90b09cd839e",
      "cw-9fb6ccb7-0ec8-41ba-a2f4-931512dcf9f9"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "window-f96ded5d-90de-45f3-a67b-4c0f77d9ee40",
    "manifestId": "https://sandbox.zenodo.org/api/iiif/record:187924/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9fb6ccb7-0ec8-41ba-a2f4-931512dcf9f9",
    "thumbnailNavigationPosition": "far-right",
    "visibleCanvases": []
  }
}