Hi Carlos,
It looks like you are using 10.3 and JMSBackendTracer is defined in both jms.pbd and Oracle-SOA-BPEL.pbd.
For 10.3+ I found advice in an internal document setup for WebLogic 12c with OSB to:
1. Comment out jms.pbd in weblogic-typical.pbl
2. Comment out these lines in toggles-typical.pbd:
#######################
# JMS Configuration
# ================
#TurnOn: JMSListenerTracing
#TurnOn: JMSConsumerTracing
#######################
# EJB 2.0 Configuration
# ================
#TurnOn: EJB2StubTracing
#TurnOn: SessionBeanTracing
#TurnOn: EntityBeanTracing
#TurnOn: MessageDrivenBeanTracing
# TurnOn: EJBMethodLevelTracing
#######################
# EJB 3.0 Configuration
# ================
#TurnOn: EJB3StubTracing
#TurnOn: SessionBean3Tracing
#TurnOn: EntityBean3Tracing
#TurnOn: MessageDrivenBean3Tracing
#TurnOn: EJB3MethodLevelTracing
Hope that helps
Thanks
Lynn