12C upgrade failed creating v_$diag_PDB_SPACE_MGMT

Hi

I'm having issues upgrading from 11G to 12C on a standard database (not CBD/PDB) -

Elapsed: 00:00:00.01

08:25:16 SQL>

08:25:16 SQL> create or replace view

08:25:16  2         v_$diag_PDB_SPACE_MGMT as select * from x$diag_PDB_SPACE_MGMT;

       v_$diag_PDB_SPACE_MGMT as select * from x$diag_PDB_SPACE_MGMT

                                               *

ERROR at line 2:

ORA-00942: table or view does not exist

Had a quick google but couldn't see anything relating to x$diag_PDB_SPACE_MGMT to see how to create it to hopefully get round the issue.

Has anyone else seen this problem

Cheers

Lesley