什么会导致“不能加载文件或程序集”有关“Microsoft.WindowsAzure.Configuration”的错误?

I have a multi-tier Azure application I've been working on. It uses web and worker roles behind an MVC front end, as well as Azure SQL and Table storage. It has been working well for a while, both in the emulator and the cloud. I have a multi-tier Azure application I've been