Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/28573/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ce0d5558-0431-48ae-82ed-e04edd8f98b0",
      "cw-0ed83df4-99f6-4798-bc57-bde03e606ed5"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-205b28a5-7d1e-4148-9d8e-e115c389a470",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/28573/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-0ed83df4-99f6-4798-bc57-bde03e606ed5"
  }
}