XSLT Error during transformation

Hi,

I am getting the below error. Please help.

com.wm.app.b2b.server.ServiceException: [B2BXSLT.0003.9003] Trax: Error during transformation - com.wm.pkg.xslt.util.LocalizedTransformerException: [B2BXSLT.0003.9001] Trax: Fatal Error - java.lang.NullPointerException