Server Error in '/' Application.

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Hi Barry, do you see any stack trace? Do you know in which document type it occurs and can you paste its code? And which Umbraco version are you using?

I am getting the same error as well. I am using umbraco 4.7.1 and Latest version of USitebuilder downloaded from CodePlex.

Any clue how to fix this error?

Following is the error stacktrace :  

[CustomAttributeFormatException: 'Tab' property specified was not found.]
   System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent) +2234

[CustomAttributeFormatException: 'Tab' property specified was not found.]
   System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent) +12622587
   System.Reflection.CustomAttribute.GetCustomAttributes(RuntimePropertyInfo property, RuntimeType caType) +149
   Vega.USiteBuilder.Util.GetAttribute(PropertyInfo propertyInfo) +68
   Vega.USiteBuilder.ManagerBase.SynchronizeContentTypeProperties(Type typeContentType, ContentType contentType, Boolean& hadDefaultValues) +209
   Vega.USiteBuilder.DocumentTypeManager.SynchronizeDocumentType(Type typeDocType, Type baseTypeDocType) +472
   Vega.USiteBuilder.DocumentTypeManager.SynchronizeDocumentTypes(Type baseTypeDocType) +146
   Vega.USiteBuilder.DocumentTypeManager.Synchronize() +56
   Vega.USiteBuilder.UmbracoManager.Synchronize() +68
   Vega.USiteBuilder.UmbracoManager.SynchronizeIfNotSynchronized() +72
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +270

Can you paste the code of a document type that is causing this problem?

 [DocumentType]

    publicclassHomePage : Page

    {

        [DocumentTypeProperty(UmbracoPropertyType.Textstring, Tab = "Google")]

        public string GoogleAnalyticCode { get; set; }

    }

[DocumentType]

    public class Page : Vega.USiteBuilder.DocumentTypeBase

    {

        [DocumentTypeProperty(UmbracoPropertyType.Textstring, Tab = "Meta")]

        public string Title { get; set; }

        [DocumentTypeProperty(UmbracoPropertyType.Textstring, Tab = "Meta")]

        public string Description { get; set; }

        [DocumentTypeProperty(UmbracoPropertyType.Textstring, Tab = "Meta")]

        public string Keyword { get; set; }     

    }

Can you tell me what is exact version of uSitBuilder that you are using (right click on .dll, Properties, Details)?

You are using .NET 4.0 for your project, right?

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