Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/15170/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-7cab12ce-ef63-48c9-96fe-73c7a926b31c",
      "cw-3e3d35cd-04d1-476d-8751-837d6dd21540"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-9cdb7ddf-193e-4e69-a96b-ac8efa903f44",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/15170/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-3e3d35cd-04d1-476d-8751-837d6dd21540"
  }
}