Spoon Api checking processor throws NullpointerException

[sureshtheeda]

I am getting NullPointerException at Launcher.prettyprint during Api checking processor.

Exception in thread "main" spoon.SpoonException: java.lang.NullPointerException
at spoon.Launcher.prettyprint(Launcher.java:777)
at spoon.Launcher.run(Launcher.java:710)
at com.cgi.pojogenerator.spoon.transformation.apichecking.ApiProcessorLauncher.main(ApiProcessorLauncher.java:17)
Caused by: java.lang.NullPointerException
at spoon.reflect.visitor.OperatorHelper.getOperatorText(OperatorHelper.java:59)
at spoon.reflect.visitor.DefaultJavaPrettyPrinter.visitCtBinaryOperator(DefaultJavaPrettyPrinter.java:507)
at spoon.support.reflect.code.CtBinaryOperatorImpl.accept(CtBinaryOperatorImpl.java:34)
at spoon.reflect.visitor.DefaultJavaPrettyPrinter.scan(DefaultJavaPrettyPrinter.java:380)
at spoon.reflect.visitor.DefaultJavaPrettyPrinter.lambda$visitCtInvocation$10(DefaultJavaPrettyPrinter.java:1333)
at spoon.reflect.visitor.ElementPrinterHelper.printList(ElementPrinterHelper.java:537)
at spoon.reflect.visitor.DefaultJavaPrettyPrinter.visitCtInvocation(DefaultJavaPrettyPrinter.java:1331)
at spoon.support.reflect.code.CtInvocationImpl.accept(CtInvocationImpl.java:46)
at spoon.reflect.visitor.DefaultJavaPrettyPrinter.scan(DefaultJavaPrettyPrinter.java:380)