Script task error in Sql server agent

Hi

My Package executed perfectly in Bids enviornment, when i try to scheadule the package  i got the error at script task

Microsoft (R) SQL Server Execute Package Utility  Version 10.0.1600.22 for 32-bit  
Copyright (C) Microsoft Corp 1984-2005. All rights reserved.    Started:  13:02:17 
 Error: 2012-12-19 14:06:19.97     Code: 0x00000001    
 Source: Merge Files      Description: System.Reflection.TargetInvocationException: 
Exception has been thrown by the target of an invocation. ---> 
System.NullReferenceException: Object reference not set to an instance of an object.     
at ScriptTask_5c1aa4b8953f4e17b72095548353ef1c.vbproj.ScriptMain.Main()  
   --- End of inner exception stack trace ---     at System.RuntimeMethodHandle.
_InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, 
RuntimeTypeHandle typeOwner)     at System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments,
 Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner)     at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder,
 Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks)     at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters,
 CultureInfo culture)    
 at System.RuntimeType.InvokeMember(String name, BindingFlags bindingFlags, Binder binder,
 Object target, Object[] providedArgs, ParameterModifier[] modifiers, CultureInfo culture, String[] namedParams)    
 at System.Type.InvokeMember(String name, BindingFlags invokeAttr, Binder binder, Object target, Object[] args, CultureInfo culture)     
at Microsoft.SqlServer.Dts.Tasks.ScriptTask.VSTATaskScriptingEngine.ExecuteScript()  End Error  DTExec: The package execution returned DTSER_FAILURE (1).  Started:  13:02:17  Finished: 14:06:20  Elapsed:  3842.33 seconds.  The package execution failed.  The step failed.

can u help on this