An error occurred during parsing of 'C:\Users\ahmed.hosny\Documents\NetBeansProjects\week1\src\week1\Week1.java'. Please report a bug against java/source and attach dump file 'C:\Users\ahmed.hosny\AppData\Roaming\NetBeans\8.1\var\log\Week1_1.dump'.
Caused: java.lang.AssertionError: Unexpected tree: (ERROR) + arr with kind: PLUS within: (ERROR) + arr with kind: PLUS
   at com.sun.tools.javac.util.Assert.error(Assert.java:133)
   at com.sun.tools.javac.comp.Attr$TypeAnnotationsValidator.validateAnnotatedType(Attr.java:4882)
   at com.sun.tools.javac.comp.Attr$TypeAnnotationsValidator.visitTypeTest(Attr.java:4736)
   at com.sun.tools.javac.tree.JCTree$JCInstanceOf.accept(JCTree.java:1846)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.tree.TreeScanner.visitApply(TreeScanner.java:200)
   at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1471)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.visitExec(TreeScanner.java:175)
   at com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1302)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:57)
   at com.sun.tools.javac.comp.Attr$TypeAnnotationsValidator.visitBlock(Attr.java:4779)
   at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:915)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Attr$TypeAnnotationsValidator.visitMethodDef(Attr.java:4717)
   at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:784)
   at com.sun.tools.javac.tree.TreeScanner.scan(TreeScanner.java:49)
   at com.sun.tools.javac.comp.Attr$TypeAnnotationsValidator.visitClassDef(Attr.java:4774)
   at com.sun.tools.javac.tree.JCTree$JCClassDecl.accept(JCTree.java:698)
   at com.sun.tools.javac.comp.Attr.validateTypeAnnotations(Attr.java:4672)
   at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4596)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4461)
   at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4389)
   at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4364)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1317)
   at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1290)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:469)
   at com.sun.tools.javac.api.JavacTaskImpl.analyze(JavacTaskImpl.java:448)
   at org.netbeans.modules.java.source.parsing.JavacParser.moveToPhase(JavacParser.java:640)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:495)
   at org.netbeans.modules.java.source.parsing.JavacParser.getResult(JavacParser.java:162)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callGetResult(TaskProcessor.java:631)
   at org.netbeans.modules.parsing.impl.SourceCache.getResult(SourceCache.java:262)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.run(TaskProcessor.java:798)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:304)
   at org.netbeans.modules.parsing.impl.TaskProcessor$RequestPerformer.execute(TaskProcessor.java:725)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:686)
   at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
   at java.util.concurrent.FutureTask.run(FutureTask.java:266)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1443)
   at org.netbeans.modules.openide.util.GlobalLookup.execute(GlobalLookup.java:68)
   at org.openide.util.lookup.Lookups.executeWith(Lookups.java:303)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:2058)