Using NHibernateProfiler without code changes

I'm trying to run NHibernate Profiler 2.0 downloaded from the hibernating rhinos site. I've registered a trial license. I read here http://www.hibernatingrhinos.com/products/nhprof/Learn/Usage/ProfileAppWithConfiguration about how to configure using it without making changes to the code.

What I did is

1. add the log4net configuration lines to an existing log4net configuration I have on my project.
2. copy HibernatingRhinos.Profiler.Appender.dll and HibernatingRhinos.Profiler.Appender.NHibernateLog4Net.dll to the debug\bin directory of my project.

When I try to run my project (debug mode) I get the following error:

Could not load file or assembly 'file:///C:\myproject\bin\Debug\HibernatingRhinos.Profiler.Appender.dll' or one of its dependencies. Operation is not supported. (Exception from HRESULT: 0x80131515)

what other dll's are missing that I need to copy?

Thanks