title: exception thrown while building the java application using netbeans
body: <p>Suddenly, while opening and building the application this exception was thrown:</p>
  
  <pre><code>java.lang.IllegalArgumentException: Malformed \uxxxx encoding.
      at java.util.Properties.loadConvert(Properties.java:552)
      at java.util.Properties.load0(Properties.java:374)
      at java.util.Properties.load(Properties.java:325)
      at org.netbeans.modules.java.source.indexing.FQN2Files.load(FQN2Files.java:112)
      at org.netbeans.modules.java.source.indexing.FQN2Files.&lt;init&gt;(FQN2Files.java:78)
      at org.netbeans.modules.java.source.indexing.FQN2Files.forRoot(FQN2Files.java:70)
      at org.netbeans.modules.java.source.indexing.JavaParsingContext.&lt;init&gt;(JavaParsingContext.java:110)
      at org.netbeans.modules.java.source.indexing.JavaCustomIndexer$2.run(JavaCustomIndexer.java:332)
      at org.netbeans.modules.java.source.indexing.JavaCustomIndexer$2.run(JavaCustomIndexer.java:328)
      at org.netbeans.modules.java.source.usages.ClassIndexManager.prepareWriteLock(ClassIndexManager.java:120)
      at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.clearFiles(JavaCustomIndexer.java:328)
      at org.netbeans.modules.java.source.indexing.JavaCustomIndexer.access$600(JavaCustomIndexer.java:123)
      at org.netbeans.modules.java.source.indexing.JavaCustomIndexer$Factory.filesDeleted(JavaCustomIndexer.java:883)
      at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.delete(RepositoryUpdater.java:2063)
      at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.scanFiles(RepositoryUpdater.java:2502)
      at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$FileListWork.getDone(RepositoryUpdater.java:2796)
  [catch] at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Work.doTheWork(RepositoryUpdater.java:2582)
      at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task._run(RepositoryUpdater.java:4681)
      at org.netbeans.modules.parsing.impl.indexing.RepositoryUpdater$Task.run(RepositoryUpdater.java:4618)
      at org.netbeans.modules.parsing.impl.TaskProcessor.callParserResultTask(TaskProcessor.java:618)
      at org.netbeans.modules.parsing.impl.TaskProcessor$CompilationJob.run(TaskProcessor.java:728)
      at java.util.concurrent.Executors$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)
  </code></pre>
  
  <p>I have searched the meaning of this error but I couldn't understand the solution. Could some body help me quickly and please to make your answer simple to follow.</p>