Hi There,

I have grabbed a clean copy of hybrid and updated it to umbraco version 7.2.4.

I then tried to save on the ZBU and kept gettng the error stating invalid version (0,0,0,0), which a few other people has came accross. I updated both ZBU site integration and libraries to the latest version 2.1.1-final and this stoped the version error but started giving me the error below.

ZbuModelsBuilder: Starting 23/03/2015 13:04:37.

ZbuModelsBuilder: ZbuModelsBuilder failed to generate code: Exception: Response status code does not indicate success (InternalServerError)

{"Message":"An error has occurred.","ExceptionMessage":"Object reference not set to an instance of an object.","ExceptionType":"System.NullReferenceException","StackTrace":"   at GetClientVersionStringFromValidateClientVersionData(Object )\r\n   at System.Web.Http.Metadata.Providers.AssociatedMetadataProvider`1.<>c__DisplayClass3.<GetMetadataForPropertiesImpl>b__0()\r\n   at System.Web.Http.Metadata.ModelMetadata.get_Model()\r\n   at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(ModelMetadata metadata, ValidationContext validationContext, Object container)\r\n   at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateProperties(ModelMetadata metadata, ValidationContext validationContext)\r\n   at System.Web.Http.Validation.DefaultBodyModelValidator.ValidateNodeAndChildren(ModelMetadata metadata, ValidationContext validationContext, Object container)\r\n   at System.Web.Http.Validation.DefaultBodyModelValidator.Validate(Object model, Type type, ModelMetadataProvider metadataProvider, HttpActionContext actionContext, String keyPrefix)\r\n   at System.Web.Http.ModelBinding.FormatterParameterBinding.<>c__DisplayClass1.<ExecuteBindingAsync>b__0(Object model)\r\n   at System.Threading.Tasks.TaskHelpersExtensions.<>c__DisplayClass36`1.<>c__DisplayClass38.<Then>b__35()\r\n   at System.Threading.Tasks.TaskHelpersExtensions.<>c__DisplayClass49.<ToAsyncVoidTask>b__48()\r\n   at System.Threading.Tasks.TaskHelpers.RunSynchronously[TResult](Func`1 func, CancellationToken cancellationToken)"}

ZbuModelsBuilder:    at Zbu.ModelsBuilder.AspNet.ModelsBuilderApi.EnsureSuccess(HttpResponseMessage result)

   at Zbu.ModelsBuilder.AspNet.ModelsBuilderApi.ValidateClientVersion()

   at Zbu.ModelsBuilder.CustomTool.CustomTool.ZbuModelsBuilder.GenerateRaw(String wszInputFilePath, String wszDefaultNamespace, IntPtr[] rgbOutputFileContents, UInt32& pcbOutput, String& errMsg)

I have tried updating other nuget packages but still have had no luck fixing this problem.

Thanks

Maxi