Problem with MEF in Windows 8 style apps (Metro)

I noticed when I use NuGet to add MVVMHelpers, the app refuses to start.  I get the following error: "Unable to activate Windows Store app xxx, The activation request failed with error 'The app didn't start'." Wow.  Totally unhelpful - even chasing down the event logs didn't really help much other than to show me a lot of weird errors get logged from Metro apps about tiles! After experimenting a bit, it turns out the fix is quite simple.  MVVMHelpers relies on MEF for composition and … [Read more...]