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java.lang.NullPointerException: 	at com.sun.tools.javac.tree.TreeInfo.skipParens(TreeInfo.java:748)	at com.sun.tools.javac.tree.TreeInfo.symbol(TreeInfo.java:851)	at com.sun.tools.javac.comp.TransTypes.visitApply(TransTypes.java:667)	at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465)	at org.jmlspecs.openjml.JmlTree$JmlMethodInvocation.accept(JmlTree.java:1909)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:490)	at com.sun.tools.javac.comp.TransTypes.visitVarDef(TransTypes.java:548)	at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:852)	at org.jmlspecs.openjml.JmlTree$JmlVariableDecl.accept(JmlTree.java:1273)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:70)	at com.sun.tools.javac.tree.TreeTranslator.visitClassDef(TreeTranslator.java:134)	at com.sun.tools.javac.comp.TransTypes.translateClass(TransTypes.java:1007)	at com.sun.tools.javac.comp.TransTypes.visitClassDef(TransTypes.java:511)	at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:693)	at org.jmlspecs.openjml.JmlTree$JmlClassDecl.accept(JmlTree.java:1068)	at com.sun.tools.javac.tree.TreeTranslator.translate(TreeTranslator.java:58)	at com.sun.tools.javac.comp.TransTypes.translate(TransTypes.java:490)	at com.sun.tools.javac.comp.TransTypes.translateTopLevelClass(TransTypes.java:1035)	at com.sun.tools.javac.main.JavaCompiler.desugar(JavaCompiler.java:1496)	at org.jmlspecs.openjml.JmlCompiler.desugar(JmlCompiler.java:399)	at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:898)	at org.jmlspecs.openjml.JmlCompiler.compile2(JmlCompiler.java:591)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:867)	at com.sun.tools.javac.main.Main.compile(Main.java:553)	at com.sun.tools.javac.main.Main.compile(Main.java:410)	at org.jmlspecs.openjml.Main.compile(Main.java:556)	at com.sun.tools.javac.main.Main.compile(Main.java:399)	at com.sun.tools.javac.main.Main.compile(Main.java:390)	at org.jmlspecs.openjml.Main.execute(Main.java:392)	at org.jmlspecs.openjml.Main.execute(Main.java:350)	at org.jmlspecs.openjml.Main.execute(Main.java:337)	at org.jmlspecs.openjml.Main.main(Main.java:309)