Strange Error?

[MitsuviKz]

I get this strange error that says, Error: SEU. And I don't know what to do about it.

 

[discochan]

When does this happen?

 

[Ang]

Restart Steam.

Edit: Wrong forum.

Fake edit: Only happens when you're in MA.

 

[MitsuviKz]

I think I'm missing some files? Or a part of something?