Missing argument for option "sql". The command line parameters are invalid.

I keep getting this error when i try to run my package from SQL JOB ..Can some please advise as to resolve this !

Message

Executed as user: .....\....... Microsoft (R) SQL Server Execute Package Utility  
Version 9.00.3042.00 for 32-bit  Copyright (C) Microsoft Corp 1984-2005. All rights reserved. Missing argument for option "sql".  The command line parameters are invalid.  The step failed.

Executing the query "backup log test with truncate_only
dbcc shrinkfile(test_log,50)
" failed with the following error: "Could not locate file '
test_log' for database 'master' in sys.database_files. 
The file either does not exist, or was dropped. ". Possible failure reasons: 
Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.