TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "http://cdm17413.contentdm.oclc.org/iiif/2/findingaids:333/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-36e53ae8-f897-4c2f-aa2a-ac5e2221fe6d",
      "cw-39d5ca24-ef65-4a8c-97bd-21d7351418e0"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-37229c48-5d28-4256-b417-a2e82e1d9b93",
    "manifestId": "http://cdm17413.contentdm.oclc.org/iiif/2/findingaids:333/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-39d5ca24-ef65-4a8c-97bd-21d7351418e0",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "http://cdm17413.contentdm.oclc.org/iiif/2/findingaids:333/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}