TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://objects.library.uu.nl/manifest/iiif/v3/1874-433048",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-6c9cfa4f-7769-440e-89df-cb2ed468c19f",
      "cw-7fae83fa-410a-4ca9-b195-5a8f046e17f6"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-a63a4d8a-b856-473a-b1d7-5915252ee961",
    "manifestId": "https://objects.library.uu.nl/manifest/iiif/v3/1874-433048",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-7fae83fa-410a-4ca9-b195-5a8f046e17f6",
    "thumbnailNavigationPosition": "far-right",
    "allowClose": false,
    "view": "single",
    "canvasIndex": "0"
  }
}