MyGeneration is a 100% free code generator/OR mapping tool. It is a powerful, full featured, extensible tool with a huge library of free, downloadable templates and excellent support. It ships with the dOOdads Architecture and has an active user community for a variety of other persistance frameworks. dOOdads is not currently under active development, but if someone wants to take up the mantle, they should post in the dOOdads forum. MyGeneration is not limited to just generating persistence frameworks. It can handle any repetitive coding task, as is evident in the variety of user-supported templates available.
is a commercial product that uses MyGeneration to generate BusinessObjects from your database schema. EntitySpaces is the .NET 2.0 successor to dOOdads, has the same lead architect, Mike Griffin, has features and significant improvements over and above just porting to .NET 2.0, and is actively maintained and supported. EntitySpaces and MyGeneration are separate programs with separate installs. MyGeneration does not include EntitySpaces templates.
And now... back to your regularly scheduled programming
The most likely cause of that error is that esPlugin.dll cannot be found. DnpUtils is a plugin that installs with MyGeneration, but esPlugin (which relies on DnpUtils) installs with EntitySpaces. MyGeneration should be installed first, closed, then EntitySpaces installed. If you continue to have issues generating with the EntitySpaces templates, please report them in the forums on the EntitySpaces site.