Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digital.libraries.psu.edu/iiif/info/maps1/4384/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
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      "cw-35bfeb60-30ff-48c9-a848-b40e2a4ce63f"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-7ddd0165-5b0c-4672-ae0b-f39c15643ba4",
    "manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/4384/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-35bfeb60-30ff-48c9-a848-b40e2a4ce63f"
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}