Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/20489/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-a51b6a23-80bb-43da-976d-dda4d8301b29",
      "cw-85b20c61-6568-4003-b02c-d90543041956"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-87a30998-54d8-4eda-84f9-aafe91262fdf",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/20489/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-85b20c61-6568-4003-b02c-d90543041956"
  }
}