U3DXT: BAD_ACCESS error when executing PersonalXT.Init()

We are using U3DXT to be able to add an event to the default iOs calendar on the fly. Using unity 5.0.1f we get the following error when executing the "PersonalXT.Init()" method in order to ask permission to use the iOs calendar:

Rethrow as TypeInitializationException: The type initializer for "U3DXT.Core.CoreXT" threw an exception.

The actual exception when debugging in Xcode is a "EXC_BAD_ACCESS" on the line where the "UiScreen" is added to the UiManager, but gives me little to no specific info.

Anyone has some info about using this U3DXT function inside Unity 5?