Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/15126/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-93053968-76b1-46ba-8b33-e59ef739f44a",
      "cw-357066a8-b732-4fc6-b706-1e493d18dc2c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-84f2d247-586a-42d2-b7b5-4eff25015fd2",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/15126/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-357066a8-b732-4fc6-b706-1e493d18dc2c"
  }
}