Mirador viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/288/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-cd3da8bd-6af2-42cc-9654-f021911842f8",
      "cw-b5b85eef-6ff9-404c-a543-82092f059066"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-48455e6d-9741-47ca-89c5-563e5a3827b7",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll246/288/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-b5b85eef-6ff9-404c-a543-82092f059066"
  }
}