Mirador Viewer

TypeError: Failed to fetch

{
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    "error": "TypeError: Failed to fetch",
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    "rotation": null,
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    "sideBarPanel": "calendar",
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      "navDate": "1876-10-21",
      "multId": "bsbmult00000002",
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    "dfgViewerUrl": "https://dfg-viewer.de/show?tx_dlf%5Bid%5D=https%3A%2F%2Fapi.digitale-sammlungen.de%2Fdfg%2Fmets%2Fmods%2Fv1%2Fdigitalobjects%2Fidentifier%2Fmdz-obj-child%3Absb00085360_00301_u001",
    "loadedManifest": "https://api.digitale-sammlungen.de/iiif/presentation/v2/bsb00085360_00301_u001/manifest",
    "shiftBookView": false,
    "switchCanvasOnSearch": false,
    "view": "single"
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}