TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://iiif-collection.lib.uchicago.edu/object/ark:/61001/b2cm6k73k70k.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-3eb6cc15-5172-4eb9-9690-6d9af717c9d8",
      "cw-82844778-d72d-42ae-b6cc-3369a90a042f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4a594f18-b17a-45b9-a7f6-39134e3755bf",
    "manifestId": "https://iiif-collection.lib.uchicago.edu/object/ark:/61001/b2cm6k73k70k.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-82844778-d72d-42ae-b6cc-3369a90a042f",
    "loadedManifest": "https://iiif-collection.lib.uchicago.edu/object/ark:/61001/b2cm6k73k70k.json",
    "canvasIndex": 2,
    "allowMaximize": false
  }
}