TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digitalcollections.library.gsu.edu/iiif/2/university:428/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-227537bb-fff0-4a18-b1d7-857a04e3b5bd",
      "cw-1cb44f41-7d26-43f4-aef0-1bbe38336591"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-551ecc9d-90c9-4764-8b35-0847cc53e4ac",
    "manifestId": "https://digitalcollections.library.gsu.edu/iiif/2/university:428/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-1cb44f41-7d26-43f4-aef0-1bbe38336591",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "https://digitalcollections.library.gsu.edu/iiif/2/university:428/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}