Help with nes2midi

[zachevator2019]

When I try to run the nes2midi script on fceux, it gives me this error:

---

...ownloads\fceux-2.6.6-win64\emu2midi-lua\nes2midi.lua:2: module 'base64' not found:
no field package.preload['base64']
no file '.\base64.lua'
no file 'E:!Downloads\fceux-2.6.6-win64\lua\base64.lua'
no file 'E:!Downloads\fceux-2.6.6-win64\lua\base64\init.lua'
no file 'E:!Downloads\fceux-2.6.6-win64\base64.lua'
no file 'E:!Downloads\fceux-2.6.6-win64\base64\init.lua'
no file '.\base64.dll'
no file '.\base6451.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\base64.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\base6451.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\clibs\base64.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\clibs\base6451.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\loadall.dll'
no file 'E:!Downloads\fceux-2.6.6-win64\clibs\loadall.dll'
stack traceback:
[C]: in function 'require'
...ownloads\fceux-2.6.6-win64\emu2midi-lua\nes2midi.lua:2: in main chunk

Is there something I'm doing wrong?
Any help would be appreciated.