How to find out what is causing an error in a BPM process

I have a very basic question and I can't figure it out from help.sap.com
I have a BPM process deployed to a SAP NW Java BPM 7.40 system. It can be triggered with a web service call.
It goes into error immediately. I go to NW Administrator > Operations > Process and Tasks > Manage Processes and see the process with status  "Error". But the "Error log" tab below is grayed out. I can't see any error message anywhere.
How do I find out what is wrong?

Ah, I didn't notice that on the history tab I can switch from Basic to Medium or Advanced, in Basic it was showing nothing. In Medium and Advanced it shows:
Mapping failed
com.sap.engine.services.jndi.persistent.exceptions720.NameNotFoundException: Object not found in lookup of test.sap.com.polreuse.ejbs.UUIDProviderLocal.
java.lang.IllegalArgumentException: Could not lookup 'test.sap.com/bpmear/LOCAL/UUIDProvider/test.sap.com.polreuse.ejbs.UUIDProviderLocal' bean
com.sap.mapping.lib.execution.api.exception.TExecutionException
at EJB::test.sap.com/bpmear/LOCAL/UUIDProvider/test.sap.com.polreuse.ejbs.UUIDProviderLocal( StandardInvocation:invoker )
at ( DeepExpression )
at UUID( TerminalPart:expression )
at result( BroadPart:child )
at ( NarrowMapping )
at com.sap.mapping.lib.execution.implementation.Compiler$StandardMappingFunction@241ade69( StandardInvocation:invoker )
at ( DeepExpression )
at MessageHeader( TerminalPart:expression )
at http://sap.com/xi/SAPGlobal20/Global:NewLBrdngFSCreateRequest( BroadPart:child )
at ( NarrowMapping )
What could this mean? I didn't deploy all parts correctly or something like that?
Also, where do I check the default trace?

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