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java.lang.NullPointerException: 	at com.sun.tools.javac.file.JavacFileManager.listContainer(JavacFileManager.java:399)	at com.sun.tools.javac.file.JavacFileManager.list(JavacFileManager.java:676)	at com.sun.tools.javac.code.ClassFinder.scanUserPaths(ClassFinder.java:564)	at com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:504)	at com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:287)	at com.sun.tools.javac.code.ClassFinder.access$000(ClassFinder.java:72)	at com.sun.tools.javac.code.ClassFinder$1.complete(ClassFinder.java:159)	at com.sun.tools.javac.code.Symbol.complete(Symbol.java:579)	at com.sun.tools.javac.comp.Enter.visitTopLevel(Enter.java:299)	at com.sun.tools.javac.tree.JCTree$JCCompilationUnit.accept(JCTree.java:509)	at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:255)	at com.sun.tools.javac.comp.Enter.classEnter(Enter.java:270)	at com.sun.tools.javac.comp.Enter.complete(Enter.java:483)	at com.sun.tools.javac.comp.Enter.main(Enter.java:467)	at com.sun.tools.javac.main.JavaCompiler.enterTrees(JavaCompiler.java:952)	at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:833)	at com.sun.tools.javac.main.Main.compile(Main.java:253)	at com.google.errorprone.BaseErrorProneCompiler.run(BaseErrorProneCompiler.java:190)	at com.google.errorprone.BaseErrorProneCompiler.run(BaseErrorProneCompiler.java:101)	at com.google.errorprone.ErrorProneCompiler.run(ErrorProneCompiler.java:131)	at com.google.errorprone.ErrorProneCompiler.compile(ErrorProneCompiler.java:73)	at com.google.errorprone.ErrorProneAntCompilerAdapter$AntRunner.apply(ErrorProneAntCompilerAdapter.java:39)	at com.google.errorprone.ErrorProneAntCompilerAdapter$AntRunner.apply(ErrorProneAntCompilerAdapter.java:36)	at com.google.errorprone.ErrorProneAntCompilerAdapter.execute(ErrorProneAntCompilerAdapter.java:72)	at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1344)	at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1070)	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)	at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)	at org.apache.tools.ant.Task.perform(Task.java:348)	at org.apache.tools.ant.Target.execute(Target.java:435)	at org.apache.tools.ant.Target.performTasks(Target.java:456)	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)	at org.apache.tools.ant.Project.executeTarget(Project.java:1376)	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)	at org.apache.tools.ant.Project.executeTargets(Project.java:1260)	at org.apache.tools.ant.Main.runBuild(Main.java:854)	at org.apache.tools.ant.Main.startAnt(Main.java:236)	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:285)	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:112)