Database in use. System Administrator must have exclusive use of database to run load.
This error occurs when you attempt to load a database dump while users are accessing the database. You cannot use the LOAD DATABASE statement while the database is in use by any user, including yourself.
Wait until all users have finished using the database, and then use the LOAD DATABASE statement. Make sure that you are not in the database being loaded when you issue the LOAD DATABASE command. Although not required, it is best to run the LOAD DATABASE statement from the master database.