Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/16121/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-802318f3-742b-4e05-b46e-a99a5a534179",
      "cw-4ae4757c-b398-474b-9b74-8943fc18bd73"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-6f631bcb-a2ce-476c-82e6-81a6f89c1ebe",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/16121/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-4ae4757c-b398-474b-9b74-8943fc18bd73"
  }
}