TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:6415/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e06fd79b-c802-4975-a15f-ee799f043fd9",
      "cw-06c3bf3e-80ae-43e6-9b05-1ac531c58d7c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-910688ef-8720-4c77-83b9-10970eb68a62",
    "manifestId": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:6415/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-06c3bf3e-80ae-43e6-9b05-1ac531c58d7c",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:6415/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}