Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/26834/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cd99cbaf-c209-4237-b66c-c686706fe350",
      "cw-78201fbb-afdf-4d54-9912-3ac1b2b38aae"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-b2f2bfa2-a48b-434c-908e-3cc11a189516",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/26834/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-78201fbb-afdf-4d54-9912-3ac1b2b38aae"
  }
}