Biztalk 2009 orchestration Exception

Hi All,

I have got the below Exception in my orchestration

Timestamp: 7/25/2014 4:54:12 AM

Message: HandlingInstanceID: 298b6bd6-d0db-40ef-8ad8-8b1f74836a2e

An exception of type ‘System.ArgumentException’ occurred and was caught.

————————————————————————

07/25/2014 00:54:12

Type : System.ArgumentException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089

Message : Item has already been added. Key in dictionary: ‘8/1/2014 4:00:00 AM’ Key being added: ‘8/1/2014 4:00:00 AM’

Source : mscorlib

Help link :

ParamName :

Data : System.Collections.ListDictionaryInternal

TargetSite : Void Insert(System.Object, System.Object, Boolean)

Stack Trace : at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)

at Afms.Core.BizTalk.ListMgmt.Orchestration_ServiceOrder.segment6(StopConditions stopOn)

at Microsoft.XLANGs.Core.SegmentScheduler.RunASegment(Segment s, StopConditions stopCond, Exception& exp)

Additional Info:

MachineName : PRXCBIZ01

TimeStamp : 7/25/2014 4:54:12 AM

FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=4.1.0.0,
Culture=neutral, PublicKeyToken=31bf3856ad364e35

AppDomainName : __XDomain_3.0.1.0_0

ThreadIdentity :

WindowsIdentity : PRESTOPROD\s_biztalksrvact

I dont have any idea on this

1. can you tell me how to debig this

2. i also see messages in non resumable for thsi orchestration and i use syste.system Exception in this orchestartion can you tell me whether it will be caught using this?i am not sure why this is coming can you help me with this