Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://zenodo.org/api/iiif/record:6480926/manifest",
    "isFetching": false
  },
  "viewer": null,
  "window": {
    "canvasId": "https://zenodo.org/api/iiif/record:6480926/canvas/Handtke%201849%20Nord%C3%B6stliches%20Afrika%20-%20Thumb.JPG",
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-ffa2f74a-93ae-48f7-ad4a-927c454b616e",
      "cw-dc4509b7-2753-4841-baba-f646d43520ef"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": true,
    "id": "window-eade7997-c84e-45d6-8484-1c9a98a8dad9",
    "manifestId": "https://zenodo.org/api/iiif/record:6480926/manifest",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-dc4509b7-2753-4841-baba-f646d43520ef",
    "thumbnailNavigationPosition": "far-right",
    "visibleCanvases": []
  }
}