Error: Unable to publish yor file in pentaho?

I am new to pentaho. I am using Pentaho Report Desiner ce-5.3.0 on Windows 7 32 bit.

When I try to publish report then login window popup then filling all fields and click on ok, it gives error.

Unable to publish your file

please try again or contact to your system administrator for assistance.

Then I have following message in error window.

Internal error occure

 java.lang.RuntimeException: org.pentaho.reporting.designer.extensions.pentaho.repository.util.PublishException: The File exists and override has not been specified.
    at org.pentaho.reporting.designer.extensions.pentaho.repository.actions.UpdateReservedCharsTask.run(UpdateReservedCharsTask.java:90)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:154)
    at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
    at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219)
    at java.awt.Dialog.show(Dialog.java:1082)
    at javax.swing.JOptionPane.showOptionDialog(JOptionPane.java:870)
    at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:667)
    at javax.swing.JOptionPane.showMessageDialog(JOptionPane.java:638)
    at org.pentaho.reporting.designer.extensions.pentaho.repository.actions.PublishToServerTask.showErrorMessage(PublishToServerTask.java:170)
    at org.pentaho.reporting.designer.extensions.pentaho.repository.actions.PublishToServerTask.run(PublishToServerTask.java:105)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:733)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:694)
    at java.awt.EventQueue$3.run(EventQueue.java:692)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:703)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: org.pentaho.reporting.designer.extensions.pentaho.repository.util.PublishException: The File exists and override has not been specified.
    at org.pentaho.reporting.designer.extensions.pentaho.repository.actions.UpdateReservedCharsTask.run(UpdateReservedCharsTask.java:84)
    ... 35 more

The version of Report designer and bi server should be same. try that and post the result.