Mirador viewer

TypeError: Failed to fetch

{
  "manifest": {
    "error": "TypeError: Failed to fetch",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/mgs/621/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-5700faf0-c85d-4398-a7fb-48561f9b34f2",
      "cw-ca2a72dc-aeb1-47b2-b45e-7a322ea09c32"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-8f95d5a8-8eea-4388-b895-c95adef31e70",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/mgs/621/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-ca2a72dc-aeb1-47b2-b45e-7a322ea09c32"
  }
}