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java.lang.NullPointerException: 	at spoon.reflect.factory.ExecutableFactory.createReference(ExecutableFactory.java:102)	at spoon.reflect.factory.ExecutableFactory.createParameterReference(ExecutableFactory.java:88)	at spoon.support.reflect.declaration.CtParameterImpl.getReference(CtParameterImpl.java:64)	at spoon.support.reflect.declaration.CtParameterImpl.getReference(CtParameterImpl.java:39)