adapter Engine error- messages are stuck

Hi Friends,

Please find the below adapter error. any body help me. what is the solution.

Messages are stuck in Adapter Engine.

error

----------

Delivering the message to the application
using connection CIDXAdapter failed, due to:
com.sap.engine.interfaces.messaging.api.exception.MessagingException:
javax.ejb.EJBTransactionRolledbackException: Exception raised from
invocation of public void
com.sap.aii.af.sdk.cidx.impl.choreography.listeners.MSCIDXListenerLocalBean.onMessage(com.sap.engine.interfaces.messaging.api.Message)
throws
com.sap.engine.interfaces.messaging.api.exception.MessagingException
method on bean instance
com.sap.aii.af.sdk.cidx.impl.choreography.listeners.MSCIDXListenerLocalBean@20ea2132
for bean
sap.com/com.sap.aii.adapter.ispeak.app*xml|com.sap.aii.adapter.ispeak.messageListener.ejb.jar*xml|MSCIDXListenerLocalBean;
nested exception is: java.lang.NullPointerException; nested exception
is: javax.ejb.EJBException: Exception raised from invocation of public
void
com.sap.aii.af.sdk.cidx.impl.choreography.listeners.MSCIDXListenerLocalBean.onMessage(com.sap.engine.interfaces.messaging.api.Message)
throws
com.sap.engine.interfaces.messaging.api.exception.MessagingException
method on bean instance
com.sap.aii.af.sdk.cidx.impl.choreography.listeners.MSCIDXListenerLocalBean@20ea2132
for bean
sap.com/com.sap.aii.adapter.ispeak.app*xml|com.sap.aii.adapter.ispeak.messageListener.ejb.jar*xml|MSCIDXListenerLocalBean;
nested exception is: java.lang.NullPointerException.

Regards,

Soma