Refreshing the page may resolve the problem.

If the audio isn’t captured correctly while you are recording your responses, you may receive an error. To fix this issue, make sure to pause before and after your response when repeating the prompts you are given and ensure that your entire response is captured. 

While you record your responses, speak at a normal pace and volume, as if you are talking to someone in the same room as you. You only need to repeat the prompt once. If you repeat the prompt multiple times, the automated speech recognition software won’t be able to score your prompt accurately, and you may receive a lower score. 

See Tips for Recording the Best Audio