TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12509/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-9ec9c786-abfd-4178-8af3-f18557fb28cc",
      "cw-d1703707-8da0-472f-8c04-95934bc87e5e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-4a674119-b39b-4a94-b152-730613f93e4c",
    "manifestId": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12509/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d1703707-8da0-472f-8c04-95934bc87e5e",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12509/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}