[BRLTTY] Error "Can't determine tty number"

[t w]

Hi,
Thank you for your answer/s! 
I now compiled and ran my program in konsole, and it compiled fine. When running, it displays:
Driver name: Papenmeier
Braille display has 1 line of 40 columns
Trying to enter in raw mode... brlapi_enterRawMode: Operation not supported
Taking control of the tty... Ok
Writing to braille display... Ok
Waiting until a braille key is pressed to continue... 

HOWEVER, nothing is actually written on the Braille display, and it also does not recognize any input.Awkwardly enough, the same output comes when the braille display is plugged out!
Any more ideas?
Thanks and best,TW

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