I’m trying to generate  a view for Asp.Net MVC 1.0 using an Entity Framework model. This is from Details.tt.  Anyone seen this error?

I get this the first time I try to generate:

error CS0234: Compiling transformation: The type or namespace name ‘Data’ does not exist in the namespace ‘System’ (are you missing an assembly reference?)

And if I try to generate again:

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Template Processing resulted in 2 Errors
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C:\Program Files\Microsoft Visual Studio 9.0\Common7\IDE\ItemTemplates\CSharp\Web\MVC\CodeTemplates\AddView\Details.tt(-1,-1) : error : The host threw an exception while trying to resolve the assembly reference ‘System.Data.Entity’. The transformation will not be run. The following Exception was thrown:

System.ArgumentOutOfRangeException: Length cannot be less than zero.

Parameter name: length

at System.Reflection.Assembly._nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)

at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.InternalLoad(String assemblyString, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)

at System.Reflection.Assembly.Load(String assemblyString)

at Microsoft.VisualStudio.Web.Mvc.MvcTextTemplateHost.Microsoft.VisualStudio.TextTemplating.ITextTemplatingEngineHost.ResolveAssemblyReference(String assemblyReference)

at Microsoft.VisualStudio.TextTemplating.Engine.CompileAndRunCode(String generatorCode, ITextTemplatingEngineHost host, TemplateProcessingSession session)