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Editorial Team
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Asked: 2026-05-11T22:35:34+00:00

Using Entity Framework, I suddenly get this strange error after publishing my asp.net mvc

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Using Entity Framework, I suddenly get this strange error after publishing my asp.net mvc project onto my Win2003 server:

[CustomAttributeFormatException: ‘IsReference’ property specified was not found.]

The error occurs when I need to update or delete an entity.

I haven’t changed anything (and yes, it’s actually true 🙂 in my model, I only recompiled it when publishing. It worked yesterday and the server haven’t changed either.

Any idea on what has gone wrong here?

Thanks in advance. Help will be much appreciated!

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1 Answer

  1. Editorial Team

    You don’t have .NET 3.5 SP1 installed on the server. Update it.

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