java.lang.NullPointerException
   at sun.awt.shell.Win32ShellFolder2$7.call(Win32ShellFolder2.java:550)
   at sun.awt.shell.Win32ShellFolder2$7.call(Win32ShellFolder2.java:547)
   at sun.awt.shell.Win32ShellFolderManager2$ComInvoker.invoke(Win32ShellFolderManager2.java:518)
   at sun.awt.shell.ShellFolder.invoke(ShellFolder.java:399)
   at sun.awt.shell.ShellFolder.invoke(ShellFolder.java:385)
   at sun.awt.shell.Win32ShellFolder2.getFileSystemPath(Win32ShellFolder2.java:547)
   at sun.awt.shell.Win32ShellFolder2.access$300(Win32ShellFolder2.java:55)
   at sun.awt.shell.Win32ShellFolder2$11.call(Win32ShellFolder2.java:727)
   at sun.awt.shell.Win32ShellFolder2$11.call(Win32ShellFolder2.java:718)
   at java.util.concurrent.FutureTask$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 sun.awt.shell.Win32ShellFolderManager2$ComInvoker$3.run(Win32ShellFolderManager2.java:487)
   at java.lang.Thread.run(Thread.java:619)