select * from T_PROFILE_VERSION as of TIMESTAMP TO_TIMESTAMP('04-08-2015','dd-mm-yy'); getting error

Am getting below error when i tried select query.

SQL> select * from T_PROFILE_VERSION as of TIMESTAMP TO_TIMESTAMP('04-08-2015','dd-mm-yy');

select * from T_PROFILE_VERSION as of TIMESTAMP TO_TIMESTAMP('04-08-2015','dd-mm-yy')

              *

ERROR at line 1:

ORA-01466: unable to read data - table definition has changed