Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/33420/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-2f3988d9-02be-48c4-88e2-9925ab2fdfc5",
      "cw-f56e9520-5d9f-4a9d-bb2e-dddd0a9523f7"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a9e71412-589e-4f9b-9f63-3242e8f0eb90",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/33420/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f56e9520-5d9f-4a9d-bb2e-dddd0a9523f7"
  }
}