An error occurred during parsing of 'F:\YTN-4GB\NMS\NMSCombined_2\src\nms\gui\MainWindow.java'. Please report a bug against java/source and attach dump file 'C:\Users\YTN\.netbeans\dev\var\log\MainWindow.dump'.
Caused: java.lang.AssertionError: isSubtype 20
   at com.sun.tools.javac.code.Types$5.visitType(Types.java:387)
   at com.sun.tools.javac.code.Types$5.visitType(Types.java:368)
   at com.sun.tools.javac.code.Type.accept(Type.java:96)
   at com.sun.tools.javac.code.Types$DefaultTypeVisitor.visit(Types.java:3516)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:364)
   at com.sun.tools.javac.code.Types.isSubtype(Types.java:340)
   at com.sun.tools.javac.comp.Check.subset(Check.java:1117)
   at com.sun.tools.javac.comp.Check.isHandled(Check.java:1212)
   at com.sun.tools.javac.comp.Flow.markThrown(Flow.java:338)
   at com.sun.tools.javac.comp.Flow.visitThrow(Flow.java:1277)
   at com.sun.tools.javac.tree.JCTree$JCThrow.accept(JCTree.java:1271)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:529)
   at com.sun.tools.javac.comp.Flow.scanStats(Flow.java:537)
   at com.sun.tools.javac.comp.Flow.visitBlock(Flow.java:830)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:789)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:529)
   at com.sun.tools.javac.comp.Flow.visitIf(Flow.java:1229)
   at com.sun.tools.javac.tree.JCTree$JCIf.accept(JCTree.java:1148)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:529)
   at com.sun.tools.javac.comp.Flow.scanStats(Flow.java:537)
   at com.sun.tools.javac.comp.Flow.visitBlock(Flow.java:830)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:789)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.scanStat(Flow.java:529)
   at com.sun.tools.javac.comp.Flow.visitMethodDef(Flow.java:758)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:676)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.visitClassDef(Flow.java:688)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:594)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Flow.analyzeTree(Flow.java:1514)
   at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1292)
   at com.sun.tools.javac.main.JavaCompiler.flow(JavaCompiler.java:1252)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:476)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:455)
   at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:578)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:435)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:155)
   at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:218)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:665)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
   at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
   at java.util.concurrent.FutureTask.run(FutureTask.java:138)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
   at java.lang.Thread.run(Thread.java:662)