setLanguage attribute must be set in the request

I get this error message from the test tool when trying to connect to NAV 2018 (below).
This only happens if I try to use the GetProductsSimple function.

Ex. GetLanguages is working as expected.

I use this version of the tool DynamicwebConnectorTestTool (2.1.0).
What might be wrong?

System.ServiceModel.FaultException: setLanguage attribute must be set in the request

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 Dynamicweb.Ecommerce.Integration.Connectors.Nav.NavDynamicwebService.DWWebService_Port.Process(Process request)
   at Dynamicweb.Ecommerce.Integration.Connectors.Nav.NavDynamicwebService.DWWebService_PortClient.Dynamicweb.Ecommerce.Integration.Connectors.Nav.NavDynamicwebService.DWWebService_Port.Process(Process request) in C:\Dynamicweb\Dynamicweb9\Integrations\DynamicwebConnectorService\Head\Dynamicweb.Ecommerce.Integration.Connectors.Nav\Service References\NavDynamicwebService\Reference.cs:line 163
   at Dynamicweb.Ecommerce.Integration.Connectors.Nav.NavDynamicwebService.DWWebService_PortClient.Process(String& request) in C:\Dynamicweb\Dynamicweb9\Integrations\DynamicwebConnectorService\Head\Dynamicweb.Ecommerce.Integration.Connectors.Nav\Service References\NavDynamicwebService\Reference.cs:line 169
   at Dynamicweb.Ecommerce.Integration.Connectors.Nav.NavConnector.ProcessRequest(String request) in C:\Dynamicweb\Dynamicweb9\Integrations\DynamicwebConnectorService\Head\Dynamicweb.Ecommerce.Integration.Connectors.Nav\NavConnector.cs:line 61
   at Dynamicweb.Ecommerce.Integration.ConnectorTestTool.TesterControl.RunTest_Click(Object sender, RoutedEventArgs e) in C:\Dynamicweb\Dynamicweb9\Integrations\DynamicwebConnectorService\Head\Dynamicweb.Ecommerce.Integration.ConnectorTestTool\TesterControl.xaml.cs:line 142

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setLanguage attribute must be set in the request

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