TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12633/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6510432c-782f-4b62-8db3-b425b037adb6",
      "cw-dc06ad33-4992-4c2b-848c-cab1fc9ddbde"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-08e9b7af-b9fa-44ef-bd4c-9ea378d6e382",
    "manifestId": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12633/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-dc06ad33-4992-4c2b-848c-cab1fc9ddbde",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:12633/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}