Sitecore TDS Can not find site context

I've been using TDS with Sitecore for a while but one of my sites has just started erroring with "Can not find site context" when trying to do a sync. Anyone know what would cause this?

The Site is Sitecore 8 and the version of TDS im using is 5.5 from Visual Studio 2015.

Stack trace is as follows:

Connection Test Pass: TDS service files are correctly installed.
Connection Test Message: Connector version local 5.5.0.19 and remote 5.5.0.19
Connection Test Pass: Access Guid check passed.
Found database master in the target Sitecore instance.
Connection Test Failure: Failed to complete test.
Exception System.Web.Services.Protocols.SoapException: Can not find site context. ---> System.InvalidOperationException: Can not find site context.
   at HedgehogDevelopment.SitecoreProject.Service.LanguageFallbackDisabler..ctor()
   at HedgehogDevelopment.SitecoreProject.Service.TDSExecutionContext.Wrap[](Func`1 func)
   at HedgehogDevelopment.SitecoreProject.Service.TdsService.GetItem(String key, String sitecoreDatabase, String accessGuid, String itemIdOrPath)
   --- End of inner exception stack trace ---
   at HedgehogDevelopment.SitecoreProject.Service.TdsService.GetItem(String key, String sitecoreDatabase, String accessGuid, String itemIdOrPath) (FaultException):

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 HedgehogDevelopment.SitecoreProject.VSIP.SitecoreConnector.TdsServiceSoap.GetItem(GetItemRequest request)
   at HedgehogDevelopment.SitecoreProject.VSIP.SitecoreConnector.TdsServiceSoapClient.HedgehogDevelopment.SitecoreProject.VSIP.SitecoreConnector.TdsServiceSoap.GetItem(GetItemRequest request)
   at HedgehogDevelopment.SitecoreProject.VSIP.SitecoreConnector.TdsServiceSoapClient.GetItem(String key, String sitecoreDatabase, String accessGuid, String itemIdOrPath)
   at HedgehogDevelopment.SitecoreProject.VSIP.ProjectTests.ConnectionTest.<>c__DisplayClass1.<Execute>b__0(String key)
   at HedgehogDevelopment.SitecoreProject.VSIP.Utils.Support.CallServiceWrapper[T](TdsServiceSoapClient client, SitecoreProjectNode project, Func`2 clientCall)
   at HedgehogDevelopment.SitecoreProject.VSIP.ProjectTests.ConnectionTest.Execute()
   at HedgehogDevelopment.SitecoreProject.VSIP.Dialogs.BuildTestDialog.RunTests()
Connection Test Finish: 2016-09-16 02:30:51

Solution

This issue had been caused from the path to the TDS service being added to the IgnoreUrlPrefix setting.