Unable to download spreadsheet from my portal.

Hi All,

I am unable to download spreadsheet from portal.Although other people are able to do so. I am getting below error.

java.lang.ClassNotFoundException: com.sap.webgui.ws.Query.class

  at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)

  at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)

  at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)

  at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)

  at java.lang.ClassLoader.loadClass(Unknown Source)

  at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)

  at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)

  at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)

  at java.lang.Thread.run(Unknown Source)

Could anyone suggest any solution to this error.

Thanks and regards,

Shalini