The latest Mono and Fluent NHibernate will give you a nice error. If you got the following error install Mono 2.8.1
Compilation Error Description: Error compiling a resource required to service this request. Review your source file and modify it to fix this error. Compiler Error Message: CS0011: Could not load type ‘FluentNHibernate.Mapping.ComponentPartBase`2[T,FluentNHibernate.Mapping.ComponentMap`1[T]]’ from assembly ‘FluentNHibernate, Version=1.1.0.685, Culture=neutral, PublicKeyToken=8aa435e3cb308880’. ~/Global.asax
