Can not launch the new version of Corona.

I just download 2014.2189. When I try to launch I get the following error: 

Corona Simulator[1589:707] Cannot remove an observer \<AppDelegate 0x7f98d3c07f60\> for the key path "fSkin" from \<AppDelegate 0x7f98d3c07f60\> because it is not registered as an observer.

I moved my old version to the trash, and deleted the preferences. But I’m still getting this error. 

I’m using OSX 10.8.5