java.lang.IllegalArgumentException: object is not an instance of declaring class *

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object is not an instance of declaring class
java.lang.IllegalArgumentException: object is not an instance of declaring class *
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at undefined.Invoker1.main(Invoker1.java:31)

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