Internal server error while creating Task Listener

Hi Team,
I was trying to create a Task create Listener to execute some custom logic.
I have created a java class DynamicAssignment inside the package com.example.flowable

I am getting the error:
“Internal server error”,“exception”:“couldn’t instantiate class com.example.flowable.listeners.DynamicAssignment”

I hope I have mapped the listener class correctly in the process definition, not sure why this is not working. Could you please help. Thanks in advance

Is the class in the classpath?

Regards
Martin

*I would like to join the source code development Do you have flowable source learning materials,

@martin.grofcik Thank you for the response

The issue got fixed when I gave the qualified name of the java class.