Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/12288/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-558acf7c-5cfc-4e03-8ac8-32ddff70c95d",
      "cw-c912dffa-f814-43c2-b996-3f061e07f0cc"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-fb75fb80-e7da-4ec7-9760-15ca7e316ccd",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/12288/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-c912dffa-f814-43c2-b996-3f061e07f0cc"
  }
}