Error when recording

I have been recording on Audacity for almost a year and all of a sudden when I try to record over a track I get an error saying "Error opening sound device. Try changing the audio host, recording device and the project sample rate’’ I HAVE TRIED EVERYTHING but I still get the error. My mic works on other programs so I dont know what the problem is, PLEASE HELP!!! I LOVE AUDACITY!!!
Thank you :mrgreen:

Have you tried this: