CMS W environment

Ok, I’m completely new to coding (I know nothing), doing a semester project on p-Pb collisions and using root to analyse a data file I already have. I have root on my computer, that’s ok, but my .root file I have will not run. I’m told I need to run it in the CMS’s W environment(?) because when I try to run my .root file I get a lot of “Warning in TClass::TClass: no dictionary for class…”. So is there a guide online or can someone please help me set up the W environment.

See for example … mputerNode

Questions about CMS you should post in the CMS hyper news directly