virtual directory for file object not work

In Server.xml  write

<Security>

      <!-- Enables virtual directory mappings for file objects in the script. -->

      <!-- This is disabled by default.                                                   -->

      <VirtualDirectoryForFile enable="true"></VirtualDirectoryForFile>

in Application.xml  write

<ScriptEngine>

     <FileObject>

    <VirtualDirectory>/logs;/opt/adobe/ams/applications/konsultant/logs</VirtualDirectory>

  </FileObject>

<!-- This specifies the max size (Kb.) the runtime can grow to before -->

<!-- garbage collection is performed.                                 -->

<RuntimeSize>20480</RuntimeSize>

</ScriptEngine>

Directory  logs  exists

If  write  the file in  /logs/file.xml

var fn = "/logs/"+room_name+".xml";

flog = new File(fn);

flog.open("utf8", "create,write");

flog.write(xml_data);

flog.flush(); //row 199

flog.close();

in log application

Sending error message: /opt/adobe/ams/applications/konsrec/main.asc: line 199: Error: File operation flush failed.

Please, help me!