TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54660/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-e7596bda-2fc5-44e6-9591-cbd0c8ede733",
      "cw-f36cc830-f6c4-4e92-b288-30548debef89"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-e6e59547-1295-45a9-be6d-c131e71caab3",
    "manifestId": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54660/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-f36cc830-f6c4-4e92-b288-30548debef89",
    "thumbnailNavigationPosition": "none",
    "allowClose": false,
    "loadedManifest": "https://digitalcollections.library.gsu.edu/iiif/2/signal:54660/manifest.json",
    "allowFullscreen": true,
    "allowMaximize": false
  }
}