Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/19991/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-b04a98b1-6b52-46df-81af-ca213c19fc2b",
      "cw-8ab85792-06e0-4f55-a6a3-d9a46c38cafa"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-dfc2f35d-44ce-42c5-ae50-aa4bdc9b824e",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/19991/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-8ab85792-06e0-4f55-a6a3-d9a46c38cafa"
  }
}