[ERROR] 2014-11-23 08:44:02,940 com.onenumber.email.MandrillEmailThread run - Error while sending email
java.io.IOException: Failed to parse response from request 'https://mandrillapp.com/api/1.0/messages/send.json'
    at com.microtripit.mandrillapp.lutung.model.MandrillRequestDispatcher.execute(MandrillRequestDispatcher.java:81)
    at com.microtripit.mandrillapp.lutung.controller.MandrillUtil.query(MandrillUtil.java:46)
    at com.microtripit.mandrillapp.lutung.controller.MandrillMessagesApi.send(MandrillMessagesApi.java:94)
    at com.microtripit.mandrillapp.lutung.controller.MandrillMessagesApi.send(MandrillMessagesApi.java:49)
    at com.onenumber.email.MandrillEmailThread.run(MandrillEmailThread.java:30)
Caused by: com.microtripit.mandrillapp.lutung.model.HandleResponseException: Error handling Mandrill response
    at com.microtripit.mandrillapp.lutung.model.MandrillRequest.handleResponse(MandrillRequest.java:74)
    at com.microtripit.mandrillapp.lutung.model.MandrillRequestDispatcher.execute(MandrillRequestDispatcher.java:78)
    ... 4 more
Caused by: java.lang.NoClassDefFoundError: org/apache/commons/io/IOUtils
    at com.microtripit.mandrillapp.lutung.model.MandrillRequest.handleResponse(MandrillRequest.java:66)
    ... 5 more