TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54411/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-422eb1d7-7a96-4dab-82fd-1e834b12449e",
      "cw-aaadffd3-bc2c-4c2f-b3c4-c8cc9cf87278"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-facef86b-2709-47e7-bdc1-db127aa09c84",
    "manifestId": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54411/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-aaadffd3-bc2c-4c2f-b3c4-c8cc9cf87278",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54411/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}