java.lang.AssertionError
   at com.sun.tools.javac.util.Assert.error(Assert.java:126)
   at com.sun.tools.javac.util.Assert.checkNonNull(Assert.java:61)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1174)
   at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1123)
   at com.sun.tools.javac.main.JavaCompiler.resolveIdent(JavaCompiler.java:728)
   at com.sun.tools.javac.model.JavacElements.nameToSymbol(JavacElements.java:161)
   at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:109)
   at com.sun.tools.javac.model.JavacElements.getTypeElement(JavacElements.java:61)
   at org.netbeans.api.java.source.SourceUtils.resolveImport(SourceUtils.java:348)
   at org.netbeans.modules.java.editor.imports.ClipboardHandler$1.run(ClipboardHandler.java:171)
   at org.netbeans.modules.java.editor.imports.ClipboardHandler$1.run(ClipboardHandler.java:143)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:635)
   at org.netbeans.api.java.source.JavaSource$1.run(JavaSource.java:625)
   at org.netbeans.api.java.source.JavaSource$MultiTask.run(JavaSource.java:479)
   at org.netbeans.modules.parsing.impl.TaskProcessor.callUserTask(TaskProcessor.java:609)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:153)
   at org.netbeans.modules.parsing.api.ParserManager$UserTaskAction.run(ParserManager.java:137)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:204)
   at org.netbeans.modules.parsing.impl.TaskProcessor$2.call(TaskProcessor.java:201)
   at org.netbeans.modules.masterfs.filebasedfs.utils.FileChangedManager.priorityIO(FileChangedManager.java:176)
   at org.netbeans.modules.masterfs.providers.ProvidedExtensions.priorityIO(ProvidedExtensions.java:360)
   at org.netbeans.modules.parsing.nb.DataObjectEnvFactory.runPriorityIO(DataObjectEnvFactory.java:141)
   at org.netbeans.modules.parsing.impl.Utilities.runPriorityIO(Utilities.java:88)
   at org.netbeans.modules.parsing.impl.TaskProcessor.runUserTask(TaskProcessor.java:201)
   at org.netbeans.modules.parsing.api.ParserManager.parse(ParserManager.java:104)
   at org.netbeans.api.java.source.JavaSource.runUserActionTaskImpl(JavaSource.java:429)
   at org.netbeans.api.java.source.JavaSource.runUserActionTask(JavaSource.java:400)
   at org.netbeans.api.java.source.JavaSource.runModificationTask(JavaSource.java:646)
   at org.netbeans.modules.java.editor.imports.ClipboardHandler.doImport(ClipboardHandler.java:143)
   at org.netbeans.modules.java.editor.imports.ClipboardHandler.access$100(ClipboardHandler.java:130)
   at org.netbeans.modules.java.editor.imports.ClipboardHandler$4$1.run(ClipboardHandler.java:233)
   at org.openide.util.RequestProcessor$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$Processor.run(RequestProcessor.java:2058)
Caused: org.openide.util.RequestProcessor$FastItem: task failed due to: java.lang.AssertionError