Transparent Data Encryption with HSM - 11gR2 on Windows

Has anyone tried implementing TDE with HSM? I am testing this in our environment and the HSM has been configured properly and I am able to generate the master key using HSM Passphrase. Also tried creating tables with encrypted columns. But when I issued a CREATE TABLESPACE command to create encrypted tablespace, an internal error was thrown. Here it is:

SQL> show user
USER is "SYS"
SQL> create tablespace tde_test datafile 'c:\app\sramalin\oradata\orcl\encryp_tbsp.dbf' size 10m encryption default storage(encrypt);
create tablespace tde_test datafile 'c:\app\sramalin\oradata\orcl\encryp_tbsp.dbf' size 10m encryption default storage(encrypt)