Cannot create an instance of the stateless bean

hi,

i am getting this error when trying to call a Sessionbean via JNDI Lookup.

Exception Details:

Caused by: java.lang.IllegalStateException

at com.sap.engine.services.ejb.session.stateless_sp5.StatelessContext.assertLegalState(StatelessContext.java:124)

at com.sap.engine.services.ejb.session.stateless_sp5.StatelessContext.getCallerPrincipal(StatelessContext.java:241)

at com.sap.engine.services.ejb.session.stateless_sp5.BeanContext.getCallerPrincipal(BeanContext.java:74)

does anyone have a clue?

thanks

norbert