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TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://dl.uc.pt/json/iiif/10316.2/87255/189401/manifest?manifest=/json/iiif/10316.2/87255/189401/manifest",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-46c217d8-b5a7-42a1-89b7-127b29bcadaa",
      "cw-937f4cb8-a46c-4c21-9148-40325d039851"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-3d197104-53b4-4ada-8846-f01b1dbf807d",
    "manifestId": "https://dl.uc.pt/json/iiif/10316.2/87255/189401/manifest?manifest=/json/iiif/10316.2/87255/189401/manifest",
    "maximized": true,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": true,
    "sideBarPanel": "canvas",
    "thumbnailNavigationId": "cw-937f4cb8-a46c-4c21-9148-40325d039851",
    "thumbnailNavigationPosition": "far-bottom",
    "imageToolsEnabled": true,
    "imageToolsOpen": true,
    "defaultView": "single"
  }
}