Here is the error message (Note I log on as sys):
SQL> @?/rdbms/admin/statscre
... Installing Required Packages

Package created.


Grant succeeded.


View created.


Package body created.


Package created.


Synonym dropped.


Synonym created.


Grant succeeded.

create view X_$KCBFWAIT as select * from X$KCBFWAIT
*
ERROR at line 1:
ORA-00955: name is already used by an existing object


Disconnected from Oracle8i Enterprise Edition Release 8.1.6.0.0 - Production
With the Partitioning option
JServer Release 8.1.6.0.0 - Production