VB.Net error: Resource lookup

[U. Cortez]

When I try to view a .vb form in an opened project I get an error that
reads:

[Resource lookup failed - infinite recursion detected. Resource name:
Arg_NullReferenceException]

This happens with any .vb form, and I've tried removing them from the
project and adding them back, but that doesn't solve anything. When I
get that pop-up error, it doesn't open the form or do anything else.
When I try to build the project, I get a similar error:

An unhandled exception of type 'System.NullReferenceException' occurred
in Unknown Module.

Additional information:
[Resource lookup failed - infinite recursion detected. Resource name:
Arg_NullReferenceException]

with the choices to Break, Continue, or Help. It doesn't give me any
locality of the problem and the error seems pretty indescript. Any
help?

Thanks,

-U.