使用骡子中的谷歌日历使用事件ID获取事件

I am new to mule and am trying to connect mule to the google API (google calendar).I have created a flow in which the first flow does the Oauth2 authentication and access tocken ID storage and in second flow i am accessing the access token ID to consume a event from the event ID using google calendar.But i am getting access tocken ID as NULL.I am new to mule and am trying to connect mule