.net – Can AddIns in MAF (System.AddIn) have constructor parameters

I've been evaluating these options and here's the conclusion that I came to.

MAF is a true addon framework. You can separate your addons completely, even running them inside a separate app domain so that if an addon crashes, it won't take down your application. It also provides a very complete way of decoupling the addons from depending on anything but the contract you give them. In fact, you can versionize your contract adapters to provide backwards compatibility to old addons while you are upgrading the main App. While this sounds great, it comes with a heavy price you have to pay in order to cross appdomains. You pay this price in speed and also in the flexibility of the types that you can send back and forth.

MEF is more like dependency injection with some additional benefits such as discoverability and ... (drawing a blank on this one). The degree of isolation that MAF has is not present in MEF. They are two different frameworks for two different things.

Looking at where the error is being raised, it's when the addin is being adapted for the host.

The issue here is that MEF is trying to find and cast to an interface it cant find.

Are your contract assemblies in the same place as your addin assembiles?