Are you sure you're performing that action with an user with dba privileges? The error message leads to believe you aren't. Take a look at the documentation here. (To create schemas with RCU on Oracle databases, you must possess the DBA privilege and be logged in as SYSDBA (for example, as user SYS, with the SYSDBA role selected).
Also, take a look at the log files in BIA_RCU_HOME\rcu\integration\biapps\schema, it may have more information in case you're already performing this action with the correct privileges.
Finally, you may want to use this space since it's for OBIA.