GUIStudioMDL trouble

This error has appeared whem I’m trying to compile model:

AppFramework : Unable to load module C:\Program Files (x86)\Steam\steamapps\username\sourcesdk\bin\orangebox\bin\filesystem_steam.dll!
Unable to load C:\Program Files (x86)\Steam\steamapps\username\sourcesdk\bin\orangebox\bin\filesystem_steam.dll

I’m only one who have this trouble?

Start SDK > refresh content. There was an update yesterday and it broke it for me too until I refreshed the content.

Okay, thank you, bro!