java.lang.UnsupportedOperationException
   at java.util.AbstractList.add(AbstractList.java:131)
   at java.util.AbstractList.add(AbstractList.java:91)
   at org.netbeans.modules.php.editor.model.impl.VariableNameImpl.createLazyFieldAssignment(VariableNameImpl.java:441)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.visit(ModelVisitor.java:693)
   at org.netbeans.modules.php.editor.parser.astnodes.Assignment.accept(Assignment.java:112)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:173)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:167)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:279)
   at org.netbeans.modules.php.editor.parser.astnodes.ExpressionStatement.accept(ExpressionStatement.java:74)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:173)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:61)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.visit(DefaultVisitor.java:93)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultTreePathVisitor.visit(DefaultTreePathVisitor.java:199)
   at org.netbeans.modules.php.editor.parser.astnodes.Block.accept(Block.java:96)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:173)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.visit(ModelVisitor.java:433)
   at org.netbeans.modules.php.editor.parser.astnodes.MethodDeclaration.accept(MethodDeclaration.java:77)
   at org.netbeans.modules.php.editor.parser.astnodes.visitors.DefaultVisitor.scan(DefaultVisitor.java:54)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scan(ModelVisitor.java:173)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.scanNoLazy(ModelVisitor.java:1333)
   at org.netbeans.modules.php.editor.model.impl.MethodScopeImpl.scan(MethodScopeImpl.java:257)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.setElementInfo(OccurenceBuilder.java:421)
   at org.netbeans.modules.php.editor.model.impl.OccurenceBuilder.build(OccurenceBuilder.java:1690)
   at org.netbeans.modules.php.editor.model.impl.ModelVisitor.getOccurence(ModelVisitor.java:1150)
   at org.netbeans.modules.php.editor.model.OccurencesSupport.getOccurence(OccurencesSupport.java:65)
   at org.netbeans.modules.php.editor.nav.OccurrencesFinderImpl.compute(OccurrencesFinderImpl.java:141)
   at org.netbeans.modules.php.editor.nav.OccurrencesFinderImpl.run(OccurrencesFinderImpl.java:112)
   at org.netbeans.modules.csl.editor.semantic.MarkOccurrencesHighlighter.processImpl(MarkOccurrencesHighlighter.java:178)
   at org.netbeans.modules.csl.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:127)
   at org.netbeans.modules.csl.editor.semantic.MarkOccurrencesHighlighter.run(MarkOccurrencesHighlighter.java:84)
   at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:676)
   at java.util.concurrent.Executors$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:619)