In the Config/Settings.(env).syrp file there is a section of setting dealing with debugging that should look similar to the following.

   SuppressErrors =  0
   DebugMode      =  1
   AutoUpdateDb   =  0
Setting DebugMode to true will enable ActiveWAFL's debug mode.
When debug mode is on, errors and exceptions will be output directly to the screen with full stack traces, as well as being sent to the normal PHP error log handler.