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java.lang.NullPointerException: 	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:696)	at com.github.javaparser.ast.expr.AssignExpr.accept(AssignExpr.java:87)	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1195)	at com.github.javaparser.ast.stmt.ExpressionStmt.accept(ExpressionStmt.java:65)	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1170)	at com.github.javaparser.ast.stmt.BlockStmt.accept(BlockStmt.java:68)	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:1030)	at com.github.javaparser.ast.body.ConstructorDeclaration.accept(ConstructorDeclaration.java:105)	at com.github.javaparser.ast.visitor.DumpVisitor.printMembers(DumpVisitor.java:204)	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:391)	at com.github.javaparser.ast.body.ClassOrInterfaceDeclaration.accept(ClassOrInterfaceDeclaration.java:97)	at com.github.javaparser.ast.visitor.DumpVisitor.visit(DumpVisitor.java:297)	at com.github.javaparser.ast.CompilationUnit.accept(CompilationUnit.java:91)	at com.github.javaparser.ast.Node.toString(Node.java:290)