Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/23954/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-8991f9f0-95fb-4d68-921f-bb15e9a15506",
      "cw-2f2eeec9-267e-4ff4-821e-399f101ae95a"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a0f24ae4-b3ad-44b1-98aa-daa20a401a32",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/23954/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-2f2eeec9-267e-4ff4-821e-399f101ae95a"
  }
}