Under SQL Server 2005 when attempting to start a Job created by a maintenance plan you may experience the following error Unable to start execution of step 1 (reason: line(1): Syntax error). The step failed. Solution is as follows
Right click the MaintenancePlan under SQL Server Agents\Jobs and click Properties.
Go down to Steps
Highlight your SubPlan and click Edit
Add a Backslash to the beginning of the path listed in the "Package" box