TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:5915/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-792feaf6-01f9-4e75-bc29-471ffb695a4f",
      "cw-9d6602f6-b612-485f-9638-7f89a728ec7e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6ba33c10-bc29-4551-89ae-3a72b2c8659b",
    "manifestId": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:5915/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-9d6602f6-b612-485f-9638-7f89a728ec7e",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "http://cdm17413.contentdm.oclc.org/iiif/2/imagecoll:5915/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}