I just started trying out the mvc-mini-profiler in my MVC3 project with EF4.1 and after changing MiniProfilerEF.Initialize(); to MiniProfilerE
MiniProfilerEF.Initialize();
MiniProfilerE
Please analyze what version of Entity Framework your application is using PM> Get-Package
and then install MiniProfiler.EF accordingly
Like in my case I installed Install-Package MiniProfiler.EF5