Logic project problem! Help!

i opened up logic 9 and when i pressed play there was like MIDI feedback coming from my speakers! a window pop up and said “Error while trying to synchronize audio sample rate 10287 recognized. check conflict between logic pro and external device” how do i fix this? Thank you

What sound card to you have?

Sorry im using headphones!

Are you running any other audio apps like editors other daws etc.?