I must say that I have just started to change a few codelines here and there so I may not be correct with this but here it goes.
You really need to make sure that you have chosen Released instead of Debug, or else there will be errors, they may not show up when you are building it but it shows up in-game.
Just go to
Build - Configuration Manager and choose Release instead of Debug, then
Build - Rebuild Solution to let it build it all (I'm not sure if you need to choose Rebuild Solution but that's the one I choose).
Also, you said "after editing the c_baseviewmodel.cpp i click Build the compile", have you also put comment on C_BaseViewModel::ShouldFlipViewModel (as it says in the tutorial)?
The tutorial is here: http://developer.valvesoftware.com/wiki/Importing_CSS_Weapons_Into_HL2