SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
{
"manifest": {
"error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
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"isFetching": false
},
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"id": "window-b6d24233-6bbc-4b9a-9d6d-7a966b33a1a9",
"manifestId": "https://digital.libraries.psu.edu/iiif/info/maps1/27872/manifest.json",
"maximized": false,
"rangeId": null,
"rotation": null,
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"sideBarPanel": "info",
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