The default locale determines the language initially used in the speech-recognition interface and on the user web interface. Users can select a different locale for their use on the user web interface. Personal Assistant (PA) uses the user's locale selection once PA identifies who is calling it or who is logging into the user web interface.
When a default locale is not selected for the PA server, this error occurs while trying to access the PA user web interface:
Your handler was unable to process the request successfully for some reason.
To fix this issue, select Pasystemadmin (http://paserver/pasystemadmin) > System > Speech Services, and move some locales from available to supported. Next, choose one of the supported locales as default locale.