WAV is silent after sending to Levelator

After sending wav file to Levelator, it says that the wav is silent and that step 3 did not complete successfully. This has just started happening these past 2 weeks, I had no problems before then. How do I fix this? I am using Windows 8.1, Audacity 2.2.2

How are you doing that?

Is this really a question about Audacity, or about Levelator?
Are you aware that Levelator is obsolete and no longer supported by the makers of that app (since 2012)?