ERROR: "Failed to start the plugin in ARA mode"

I loaded the new 1.11.0b3 (beta 3) ARA version with a project that had a 1.11.0b2 (beta 2) ARA version loaded in the Melody track and it blew up (“Failed to start the plugin in ARA mode”). Is that by design and if so then how do I salvage all my previous Reaper projects that have the beta 2 ARA plugin loaded?