HTTP Status-500 Error when try to open Explorer from BI Launch Pad?

Hi,

I logged into SAP BI Launch Pad and tried to open Explorer from Applications link in BI Launch Pad.

At this instant i'm getting an error " HTTP Status 500 - javax.servlet.ServletException: java.lang.NoSuchMethodError: com.businnesobjects.swd.appcontext.RequestInfo.getCafAppContext()Lcom/businessobjects/swd/appcontext/CafAppContext;".

The detail error message in the below attached screenshot.

Can anyone help me to solve the above.

Thanks & Regards,

Ramana.