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Exception while invoking TaskListener: null

Question asked by nal_raj on Oct 8, 2015
Latest reply on Jan 18, 2016 by sherry
Hi I am getting following Error while upgrading from 5.9 to 5.18.0
Do i need to implement custom TaskListener? How i can do that?

Caused by: org.activiti.engine.ActivitiException: Exception while invoking TaskListener: null
        at org.activiti.engine.impl.bpmn.helper.ClassDelegate.notify(ClassDelegate.java:119) [activiti-engine-5.18.0.jar:5.18.0]
        at org.activiti.engine.impl.delegate.TaskListenerInvocation.invoke(TaskListenerInvocation.java:34) [activiti-engine-5.18.0.jar:5.18.0]
        at org.activiti.engine.impl.delegate.DelegateInvocation.proceed(DelegateInvocation.java:37) [activiti-engine-5.18.0.jar:5.18.0]
        at org.activiti.engine.impl.delegate.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:25) [activiti-engine-5.18.0.jar:5.18.0]
        at org.activiti.engine.impl.persistence.entity.TaskEntity.fireEvent(TaskEntity.java:728) [activiti-engine-5.18.0.jar:5.18.0]
        … 265 more

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