ASP.NET Page says I need to reference an assembly that does not exist!

Question

My asp.net site has to run on several client servers. It\'s working fine on a majority of them, but a couple have run into an error message on a few pages:

Answer 1

The above solutions have worked for me in the past, but not this time.

I finally found the cause: one of those server side tags (like <%# Eval("Something") %> ) from the attribute of a control on the aspx page.

I'd added it shortly before the problem appeared, and removing it made the problem go away. It was in a TemplateField on a GridView.

Bizarre, but that's what did the trick.