Does anyone know why this error occurs?
It is a sample from the great biztalkguru Stephen W. Thomas' blog
I thought i would give it try but..:

Event Type:	Error
Event Source:	XLANG/s
Event Category:	None
Event ID:	10001
Date:		1/25/2006
Time:		3:12:56 PM
User:		N/A
Computer:	CCOGCO-RKX8K1SM
Description:
Failed while creating a DynamicMaps.Orchestrations.DynamicMapsOrch service.

Exception type: ServiceCreationException
The following is a stack trace that identifies the location where the
exception occured

at
Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._createOrRehydrateRealService(
Guid& instanceId, IBTMessage currMsg)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._serviceCreator(Guid&
instanceId, Object objCurrMsg)
at Microsoft.XLANGs.Core.ResourceContainer._allocateResource(Guid& key,
UInt32 hashKey, ResourceCreator resCreator, Object creationContext)
at Microsoft.XLANGs.Core.ResourceContainer.Dispense(Guid& key,
ResourceCreator resCreator, Object creationContext)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._dispenseService(Guid&
instanceId, IBTMessage currMsg)
at
Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._tryReceiveOneMessage(Boolean&
loggedError, Guid& instanceId, IBTMessage currMsg)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._receiveOneMessage(Guid&
instanceId, Guid& serviceId, IBTMessage currentMsg)
at
Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession.ReceiveMessages(IBTMessage[
;]
messages, Int32 firstIdx, Int32 count)
at
Microsoft.BizTalk.XLANGs.BTXEngine.AppDomains.AppDomainRoot.Microsoft.XLANGs
.BizTalk.ProcessInterface.IAppDomainStub.ReceiveMessages(Object objMsg)
at
Microsoft.XLANGs.BizTalk.CrossProcess.AppDomainStubProxy.Microsoft.XLANGs.Bi
zTalk.ProcessInterface.IAppDomainStub.ReceiveMessages(Object msgs)
at
System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(In
tPtr
md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInCon
text,
Object[]& outArgs)
at
System.Runtime.Remoting.Messaging.StackBuilderSink.PrivateProcessMessage(Run
timeMethodHandle
md, Object[] args, Object server, Int32 methodPtr, Boolean fExecuteInCon
text,
Object[]& outArgs)
at
System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessa
ge msg, Int32 methodPtr, Boolean fExecuteInContext)
at
System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessa
ge msg)
at
System.Runtime.Remoting.Messaging.ServerObjectTerminatorSink.SyncProcessMess
age(IMessage reqMsg)
at
System.Runtime.Remoting.Messaging.ServerContextTerminatorSink.SyncProcessMes
sage(IMessage reqMsg)
at
System.Runtime.Remoting.Channels.CrossContextChannel.SyncProcessMessageCallb
ack(Object[] args)
at
System.Threading.Thread. CompleteCrossContextCallback(InternalCro
ssContextDel
egate ftnToCall, Object[] args)
at System.Threading.Thread.InternalCrossContextCallback(Context ctx,
IntPtr ctxID, Int32 appDomainID, InternalCrossContextDelegate ftnToCall,
Object[] args)
at
System.Runtime.Remoting.Channels.CrossContextChannel.SyncProcessMessage(IMes
sage reqMsg)
at
System.Runtime.Remoting.Channels.ChannelServices.SyncDispatchMessage(IMessag
e
msg)
at System.Runtime.Remoting.Channels.CrossAppDomainSink.DoDispatch(Byte[]
reqStmBuff, SmuggledMethodCallMessage smuggledMcm,
SmuggledMethodReturnMessage& smuggledMrm)
at
System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatchCall
back(Object[] args)
at
System.Threading.Thread. CompleteCrossContextCallback(InternalCro
ssContextDel
egate ftnToCall, Object[] args)

Additional error information:

Could not load file or assembly 'DynamicMaps.Orchestrations,
Version=1.0.0.0, Culture=neutral, PublicKeyToken=faed587cb93de4ea' or one of
its dependencies. The system cannot find the file specified.

Exception type: FileNotFoundException
Source: mscorlib
Target Site: Void* _GetTypeByName(System.String, Boolean, Boolean, Boolean,
System.Threading.StackCrawlMark ByRef, Boolean)
The following is a stack trace that identifies the location where the
exception occured

at System.RuntimeTypeHandle._GetTypeByName(String name, Boolean
throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark&
stackMark, Boolean loadTypeFromPartialName)
at System.RuntimeTypeHandle.GetTypeByName(String name, Boolean
throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark&
stackMark)
at System.RuntimeType.PrivateGetType(String typeName, Boolean
throwOnError, Boolean ignoreCase, Boolean reflectionOnly, StackCrawlMark&
stackMark)
at System.Type.GetType(String typeName, Boolean throwOnError)
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXServiceStaticState.Resolve()
at Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._createNewService(Guid&
serviceId, Guid& instanceId, BTXServiceStaticState staticState)
at
Microsoft.BizTalk.XLANGs.BTXEngine.BTXSession._createOrRehydrateRealService(
Guid& instanceId, IBTMessage currMsg)


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