Backupexec job fail after move the EV database to another SQL server

Hi,

I just move the Enterprise Vault Database to a new SQL 2008 server by using this technote: http://www.symantec.com/business/support/index?page=content&id=TECH35744. The database move success and EV works normally. 

Then I install agent on new SQL server and edit the EV backup job in backupexec, change it backup the EV database from new SQL database. Run the test credentials is OK.

However, the job was failed and error is "0xe0008492 - Database Query Failure. See the job log for details." and "an error occurred on a query to database".

Now I only can use the backup task in SQL Server itself to backup the .bak first.

Any idea? Thanks