Getting ERROR message unable to validate user during the HornetQ startup

Issue

• JBoss throws ERROR messages during the startup of HornetQ. The ERROR logs are as following

05:32:43,645 ERROR [org.hornetq.core.protocol.core.impl.HornetQPacketHandler] (Old I/O server worker (parentId: 1696074172, [id: 0x651809bc, /10.84.36.72:5545])) Failed to create session : HornetQException[errorCode=105 message=Unable to validate user: testuser]
        at org.hornetq.core.security.impl.SecurityStoreImpl.authenticate(SecurityStoreImpl.java:147) [hornetq-core.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)]
        at org.hornetq.core.server.impl.HornetQServerImpl.createSession(HornetQServerImpl.java:858) [hornetq-core.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)]
        at org.hornetq.core.protocol.core.impl.HornetQPacketHandler.handleCreateSession(HornetQPacketHandler.java:187) [hornetq-core.jar:2.2.19.SNAPSHOT (HQ_2_2_23_Final, 122)]
        ...

What could be causing this exception?