ASP.NET & IIS7 Error: Could not load file or assembly 'System.Data.SQLite'

This was annoying. I setup an ASP.NET MVC3 web application on a fresh install of Windows 2008 R2 and got the following error:

Could not load file or assembly 'System.Data.SQLite' or one of its dependencies. An attempt was made to load a program with an incorrect format.

I wasn't even using SQLite in my project; at least that's what I thought. Turns out ELMAH was trying to load it.

The error is due to trying to load the 32bit SQLite.dll on a 64 bit server.

To fix the error set Enable 32-Bit Applications to True for your Application Pool under Advanced Settings.