Squawkbox was unable to initialize voice

Hi I'm using Squawkbox 4 with FSX and when I open it I get this error: http://www.squawkbox.../startvoice.php I don't use AVC, ASRC or Roger Wilco and my sound drivers are updated so how can I fix it? PD: everything works perfectly but I can't hear the ATC and the other pilots, I just can chat and I can see the other planes (I don't care about talking to the ATC because I don't use a mic but I want to hear him) PD2: I alredy tried re-installing it but I still get the same error