TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://figgy.princeton.edu/concern/scanned_resources/28553929-dc49-43fa-a87b-537185874dae/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-0125dbb7-258f-4c23-81c7-f188df084fbe",
      "cw-e278501c-e2e7-4c25-9caf-fe9b054339cb"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7f9919ac-8eb1-4ae8-ba01-5187f500d84b",
    "manifestId": "https://figgy.princeton.edu/concern/scanned_resources/28553929-dc49-43fa-a87b-537185874dae/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-e278501c-e2e7-4c25-9caf-fe9b054339cb",
    "loadedManifest": "https://figgy.princeton.edu/concern/scanned_resources/28553929-dc49-43fa-a87b-537185874dae/manifest",
    "canvasIndex": 2,
    "allowMaximize": false
  }
}