Error in Demantra Cleanup

Hi All,

I want to cleanup data from current Demantra installation.

I am using SQL developer for access to database.

I tried following script -

execute data_cleanup.clean_level_data;

But I am getting error -

ORA-00900 Invalid SQL Statement

00900 0000-"invalid SQL statement"

*Cause:

*Action:

Vendor code 900Error at Line:1

Need help to resolve this and cleanup all the data from Demantra.

Thanks