export .wav to mp3 fails

I I attach a bug report. Can the experts please help me? I get this:
2:30:14: Audacity 2.1.2
12:30:14: Trying to load FFmpeg libraries…
12:30:14: Trying to load FFmpeg libraries from default path, ‘C:\Program Files\FFmpeg for Audacity\avformat-55.dll’.
12:30:14: Looking up PATH environment variable…
12:30:14: PATH = 'C:\Program Files\PC Connectivity Solution;C:\Program Files\NVIDIA Corporation\PhysX\Common;C:\ProgramData\Oracle\Java\javapath;C:\Program Files\Common Files\Microsoft Shared\Windows Live;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Program Files\Windows Live\Shared;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0;C:\Program Files\Skype\Phone'
12:30:14: Checking that ‘C:\Program Files\FFmpeg for Audacity’ is in PATH…
12:30:14: Warning: FFmpeg directory ‘C:\Program Files\FFmpeg for Audacity’ is not in PATH.
12:30:14: Temporarily prepending ‘;C:\Program Files\FFmpeg for Audacity’ to PATH…
12:30:14: Checking for monolithic avformat from ‘C:\Program Files\FFmpeg for Audacity\avformat-55.dll’.
12:30:14: Error: Couldn’t find symbol ‘avutil_version’ in a dynamic library (error 127: the specified procedure could not be found.)
12:30:14: Error: Couldn’t find symbol ‘avcodec_version’ in a dynamic library (error 127: the specified procedure could not be found.)
12:30:14: avformat not monolithic
12:30:14: Loading avutil from ‘avutil-52.dll’.
12:30:14: Loading avcodec from ‘avcodec-55.dll’.
12:30:14: Loading avformat from ‘C:\Program Files\FFmpeg for Audacity\avformat-55.dll’.
12:30:14: Returning PATH to previous setting…
12:30:14: Actual avutil path C:\Program Files\FFmpeg for Audacity\avutil-52.dll
12:30:14: Actual avcodec path C:\Program Files\FFmpeg for Audacity\avcodec-55.dll
12:30:14: Actual avformat path C:\Program Files\FFmpeg for Audacity\avformat-55.dll
12:30:14: Importing symbols…
12:30:14: All symbols loaded successfully. Initializing the library.
12:30:14: Retrieving FFmpeg library version numbers:
12:30:14: AVCodec version 0x373466 - 55.52.102 (built against 0x373466 - 55.52.102)
12:30:14: AVFormat version 0x372164 - 55.33.100 (built against 0x372164 - 55.33.100)
12:30:14: AVUtil version 0x344264 - 52.66.100 (built against 0x344264 - 52.66.100)
12:30:14: FFmpeg libraries loaded successfully.
12:30:42: Report generated to: C:\Users\Dave\AppData\Local\Temp\Audacity_dbgrpt-7796-20160228T123024.zip

You did not attach anything. Please see here for how to attach files: https://forum.audacityteam.org/t/how-to-attach-files-to-forum-posts/24026/1

If you still need help, please describe exactly what steps you are taking to export MP3 and exactly what happens when you do. Tell us the full text of any error messages you receive.

If you don’t have the necessary LAME MP3 encoder yet, please obtain it here: http://manual.audacityteam.org/o/man/faq_installation_and_plug_ins.html#lame.