Document management webservice giving error whicle moving physical item container

Hi Team,

When I am trying to move a physical item container present in one folder to another folder, it is throwing an below exception

Type : System.ServiceModel.FaultException, System.ServiceModel, Version=4.0.0.0, Culture=neutral

Message : Error moving 'Physical Item Container' to 'Folder'. [E648871951]

Code : System.ServiceModel.FaultCode

Data : System.Collections.ListDictionaryInternal
TargetSite : Void HandleReturnMessage(System.Runtime.Remoting.Messaging.IMessage, System.Runtime.Remoting.Messaging.IMessage)
HResult : -2146233087
Stack Trace :
Server stack trace:
   at System.ServiceModel.Channels.ServiceChannel.HandleReply(ProxyOperationRuntime operation, ProxyRpc& rpc)
   at System.ServiceModel.Channels.ServiceChannel.Call(String action, Boolean oneway, ProxyOperationRuntime operation, Object[] ins, Object[] outs, TimeSpan timeout)
   at System.ServiceModel.Channels.ServiceChannelProxy.InvokeService(IMethodCallMessage methodCall, ProxyOperationRuntime operation)
   at System.ServiceModel.Channels.ServiceChannelProxy.Invoke(IMessage message)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at .DocumentManagement.MoveNode(MoveNodeRequest request)
   at Document_Management.MoveNode(Int32 iNodeId, Int32 iParentFolderId, String& MoveMessages)

Can some please provide details about this exception.

Also if there is any documentation available for the document management webservice can you provide the link details for that.