Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/29479/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-88aebcba-82ac-469c-bf75-e0ef3d6527af",
      "cw-93c55b1e-1d83-4794-bdef-e1be4ab09d9f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-40e5668a-ae5f-4773-b3f2-b11861be6704",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/29479/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-93c55b1e-1d83-4794-bdef-e1be4ab09d9f"
  }
}