XLANG NullReferenceException !!!

Haulted with my futher development due to this Unknown error....Please advice....TIA

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Event Type: Error
Event Source: XLANG/s
Event Category: None
Event ID: 0
Date: 8/7/2007
Time: 10:58:28 AM
User: N/A

Description:
NullReferenceException exception occurred while the XLANG/s runtime enlisted a service.
Error messagebject reference not set to an instance of an object.
Call stack: at Microsoft.BizTalk.XLANGs.BTXEngine.BTXXlangStore.CreateSubscription(IBTMessageAgentFactory factory, IBTMessageBatchEx batchEx, Guid ServiceID, String ServiceName, String operationName, PredicateGroup[] preds, Object[] portArgs, Int32 priority, Guid convoyId, Boolean canActivateConvoy, Int32 iIndex)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXServiceStaticState.PersistState(String mgmtDBServer, String mgmtDBName, String MsgBoxGroupName, String ApplicationName, String serviceAssembly, String serviceTypeName, Guid[] PortIDs, Guid[] LrpIDs, Delegate satAssemblyCacheCallback, ITransaction transaction)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXService.GoLive(String configDBServer, String configDBName, String msgBoxGroupName, String applicationName, String servicePath, String serviceTypeName, Guid[] portIDs, Guid[] lrpIDs, Delegate satAssemblyCacheCallback, ITransaction transaction)

Exception type: BTXEnlistmentException
Additional error information:

Object reference not set to an instance of an object.

Exception type: NullReferenceException
Source: Microsoft.XLANGs.BizTalk.Engine
Target Site: System.Guid CreateSubscription(Microsoft.BizTalk.Agent.Interop.IBTMessageAgentFactory, Microsoft.BizTalk.Agent.Interop.IBTMessageBatchEx, System.Guid, System.String, System.String, Microsoft.XLANGs.Core.PredicateGroup[], System.Object[], Int32, System.Guid, Boolean, Int32)
The following is a stack trace that identifies the location where the exception occured

at Microsoft.BizTalk.XLANGs.BTXEngine.BTXXlangStore.CreateSubscription(IBTMessageAgentFactory factory, IBTMessageBatchEx batchEx, Guid ServiceID, String ServiceName, String operationName, PredicateGroup[] preds, Object[] portArgs, Int32 priority, Guid convoyId, Boolean canActivateConvoy, Int32 iIndex)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXServiceStaticState.PersistState(String mgmtDBServer, String mgmtDBName, String MsgBoxGroupName, String ApplicationName, String serviceAssembly, String serviceTypeName, Guid[] PortIDs, Guid[] LrpIDs, Delegate satAssemblyCacheCallback, ITransaction transaction)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXService.GoLive(String configDBServer, String configDBName, String msgBoxGroupName, String applicationName, String servicePath, String serviceTypeName, Guid[] portIDs, Guid[] lrpIDs, Delegate satAssemblyCacheCallback, ITransaction transaction)

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[3263 byte] By [vai2000] at [2008-1-7]