"bproc_user_group" and bproc_user_group_role_link does not exist

I have aproblem in BPOC when trying to open my tasks or User groups , I expected that the CUBA Studio to run the init scripts or I have to do this manually

org.postgresql.util.PSQLException: ERROR: relation “bproc_user_group” does not exist
Position: 128
at com.haulmont.cuba.core.sys.ServiceInterceptor.aroundInvoke(ServiceInterceptor.java:124)
at sun.reflect.GeneratedMethodAccessor178.invoke(Unknown Source)

After you add the add-on you should run the CUBA - Update Database command in CUBA Studio.
In production environment you can enable automatic database creation and update. See the Creating and Updating Database in Production section in CUBA manual.