TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://objects.library.uu.nl/manifest/iiif/v3/1874-387756",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f9a16297-a968-40d0-a737-d878cdafde47",
      "cw-ec038be5-2f81-45f0-abfa-2ddf73ec0874"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-cbc1bec1-9371-4e32-b9a4-afad978385af",
    "manifestId": "https://objects.library.uu.nl/manifest/iiif/v3/1874-387756",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ec038be5-2f81-45f0-abfa-2ddf73ec0874",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "view": "single",
    "canvasIndex": "0"
  }
}