Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/20704/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-00bb10fb-9fbf-4378-a7ca-6af7f34be1ab",
      "cw-1fe6afb1-bb4f-43fb-a349-bdad206bd25e"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-f47e5dd2-2d07-4d24-8476-256657fbc54c",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/20704/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1fe6afb1-bb4f-43fb-a349-bdad206bd25e"
  }
}