Nobody can tell you anything without proper system info or other technical details like version of AE, comp settings, details about the audio file and so on.
The first thing to try is another source for your audio or your original project. The second thing to check is your system preference settings. If you cannot solve the problem by checking those two items then we need to know and see your composition and timeline with all modified properties of the Audio Spectrum and the Audio layer revealed. Select them both in the timeline and press the U key twice, take a screenshot, and describe in detail how you assembled the composition. It would also be helpful to have the audio layer selected in the Project Panel so we could see the specifications.
Thanks man! i'm not sure what it was but for now I got my audio working again! Again thanks to everyone who replied!