Error console log

Lightning: [calGoogleCalendar] Failed freebusy request: [Exception... "A request Error Occurred. Status Code: 400 Bad Request Body: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "badRequest",
    "message": "Bad Request"
   }
  ],
  "code": 400,
  "message": "Bad Request"
 }
}
"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://gdata-provider/legacy/modules/gdataRequest.jsm :: fail :: line 232"  data: no] 2 gdataSession.jsm:562
aElement is null 2 calendar-ui-utils.js:180
Lightning: [calGoogleCalendar] Failed freebusy request: [Exception... "A request Error Occurred. Status Code: 400 Bad Request Body: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "badRequest",
    "message": "Bad Request"
   }
  ],
  "code": 400,
  "message": "Bad Request"
 }
}
"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://gdata-provider/legacy/modules/gdataRequest.jsm :: fail :: line 232"  data: no] 2 gdataSession.jsm:562
NS_ERROR_NOT_AVAILABLE: ActivityManager.jsm:127
    getActivity resource://gre/modules/ActivityManager.jsm:127
    removeActivity resource://gre/modules/ActivityManager.jsm:80
    onFolderRemovedFromQ resource:///modules/activity/autosync.jsm:244
    _timerCallback resource:///modules/AppIdleManager.jsm:30
aElement is null 2 calendar-ui-utils.js:180
    removeChildren chrome://calendar/content/calendar-ui-utils.js:180
    gdataInitUI resource://gdata-provider/legacy/modules/ui/gdata-lightning-item-iframe.jsm:147
    x resource://gdata-provider/legacy/modules/gdataUtils.jsm:1383
    commonUpdateReminder chrome://calendar/content/calendar-dialog-utils.js:514
    updateReminder chrome://lightning/content/lightning-item-iframe.js:1602
    updateCalendar chrome://lightning/content/lightning-item-iframe.js:2757
    updateCalendar self-hosted:844
    gdataInitUI resource://gdata-provider/legacy/modules/ui/gdata-lightning-item-iframe.jsm:36
    x resource://gdata-provider/legacy/modules/gdataUtils.jsm:1383
    loadDialog chrome://lightning/content/lightning-item-iframe.js:816
    onLoad chrome://lightning/content/lightning-item-iframe.js:445
    onload chrome://lightning/content/lightning-item-iframe.xhtml:1
Uncaught TypeError: aElement is null
    removeChildren chrome://calendar/content/calendar-ui-utils.js:180
    gdataInitUI resource://gdata-provider/legacy/modules/ui/gdata-lightning-item-iframe.jsm:147
    x resource://gdata-provider/legacy/modules/gdataUtils.jsm:1383
    commonUpdateReminder chrome://calendar/content/calendar-dialog-utils.js:514
    updateReminder chrome://lightning/content/lightning-item-iframe.js:1602
    updateCalendar chrome://lightning/content/lightning-item-iframe.js:2757
    gdataInitUI resource://gdata-provider/legacy/modules/ui/gdata-lightning-item-iframe.jsm:36
    x resource://gdata-provider/legacy/modules/gdataUtils.jsm:1383
    loadDialog chrome://lightning/content/lightning-item-iframe.js:816
    onLoad chrome://lightning/content/lightning-item-iframe.js:445
    onload chrome://lightning/content/lightning-item-iframe.xhtml:1
calendar-ui-utils.js:180:10
Lightning: [calGoogleCalendar] Failed freebusy request: [Exception... "A request Error Occurred. Status Code: 400 Bad Request Body: {
 "error": {
  "errors": [
   {
    "domain": "global",
    "reason": "badRequest",
    "message": "Bad Request"
   }
  ],
  "code": 400,
  "message": "Bad Request"
 }
}
"  nsresult: "0x80040111 (NS_ERROR_NOT_AVAILABLE)"  location: "JS frame :: resource://gdata-provider/legacy/modules/gdataRequest.jsm :: fail :: line 232"  data: no] gdataSession.jsm:562
NS_ERROR_NOT_AVAILABLE: ActivityManager.jsm:127
    getActivity resource://gre/modules/ActivityManager.jsm:127
    removeActivity resource://gre/modules/ActivityManager.jsm:80
    onFolderRemovedFromQ resource:///modules/activity/autosync.jsm:244
    _timerCallback resource:///modules/AppIdleManager.jsm:30