SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON
{
"manifest": {
"error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
"id": "/api/digital_items/439/2/manifest.json/",
"isFetching": false
},
"window": {
"collectionIndex": 0,
"companionAreaOpen": true,
"companionWindowIds": [
"cw-295587fa-9975-4f5a-b423-e2b9ea412676",
"cw-5704c5be-6b5b-440c-ac92-6e0cbfa7cb91"
],
"draggingEnabled": true,
"highlightAllAnnotations": false,
"id": "window-e3c2e840-e52c-4bb1-9417-7ae254f65af3",
"manifestId": "/api/digital_items/439/2/manifest.json/",
"maximized": false,
"rangeId": null,
"rotation": null,
"selectedAnnotations": {},
"sideBarOpen": false,
"sideBarPanel": "annotations",
"thumbnailNavigationId": "cw-5704c5be-6b5b-440c-ac92-6e0cbfa7cb91",
"thumbnailNavigationPosition": "off",
"loadedManifest": "/api/digital_items/439/2/manifest.json/",
"canvasIndex": 0
}
}