Unable to run application

Hello everyone,

I am building a project using cuba version of 6.4. I am able to build project successfully. But after starting the tomcat server when I am running the application some exception is being thrown. Here I have attached the exception. Can anyone please help me what is the exception here and what I should do?

2018-10-24 21:29:18.530 ERROR [localhost-startStop-1] eclipselink.ejb - 
2018-10-24 21:29:18.547 ERROR [localhost-startStop-1] com.haulmont.bpm.core.BpmAppContextListener - Exception on registering custom stencils
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is javax.persistence.PersistenceException: Exception [EclipseLink-28019] (Eclipse Persistence Services - 2.6.2.cuba12): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Deployment of PersistenceUnit [sem] failed. Close all factories for this PersistenceUnit.
Internal Exception: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.6.2.cuba12): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 

Exception [EclipseLink-60] (Eclipse Persistence Services - 2.6.2.cuba12): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The method [_persistence_set_rolecode_vh] or [_persistence_get_rolecode_vh] is not defined in the object [com.bipros.sem.entity.SemUser].
Internal Exception: java.lang.NoSuchMethodException: com.bipros.sem.entity.SemUser._persistence_get_rolecode_vh()
Mapping: org.eclipse.persistence.mappings.ManyToOneMapping[rolecode]
Descriptor: RelationalDescriptor(com.bipros.sem.entity.SemUser --> [])

Please perform Clean and Assemble using CUBA Studio. Restart application after that.