Could not load type ‘Microsoft.Office.Server.Search.Administration.SearchServiceApplicationProxy’ from assembly ‘Microsoft.Office.Server.Search, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’

I created a console application to automate the creation of SharePoint 2010 Search Managed Properties for a project I’m working on. I started the application from Visual Studio and received the following error:

TypeLoadException was unhandled

Could not load type ‘Microsoft.Office.Server.Search.Administration.SearchServiceApplicationProxy’ from assembly ‘Microsoft.Office.Server.Search, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c’

As usual I’d forgotten to change the platform target from x86 to x64…