Trying to play a mp3 file, but it says I miss ffmpeg even though I have it

Here is the code, copied straight from the documentation:

bot.joinVoiceChannel(voiceChannel, function(error, events) {
    //Check to see if any errors happen while joining.
    if (error) return console.error(error);
    currentVoiceChannel = voiceChannel;

    //Then get the audio context
    bot.getAudioContext(voiceChannel, function(error, stream) {
        //Once again, check to see if any errors exist
        if (error) return console.error(error);

        //Create a stream to your file and pipe it to the stream
        //Without {end: false}, it would close up the stream, so make sure to include that.
        fs.createReadStream("AnswerBot/Music/Ylvis/" + chosenSong.name + ".mp3").pipe(stream, {end: false});
        isPlayingMusic= true;

        //The stream fires `done` when it's got nothing else to send to Discord.
        stream.on('done', leaveVoice);
    });
});

I then get this error:

Error: You need either 'ffmpeg' or 'avconv' and they need to be added to PATH
    at handleErrCB (E:\DiscordBots\answerbot\node_modules\discord.io\lib\index.j
s:1300:25)
    at DiscordClient.DCP.getAudioContext (E:\DiscordBots\answerbot\node_modules\
discord.io\lib\index.js:1266:23)
    at E:\DiscordBots\answerbot\bot.js:471:10
    at call (E:\DiscordBots\answerbot\node_modules\discord.io\lib\index.js:1451:
11)
    at Timeout._onTimeout (E:\DiscordBots\answerbot\node_modules\discord.io\lib\
index.js:1984:35)
    at ontimeout (timers.js:469:11)
    at tryOnTimeout (timers.js:304:5)
    at Timer.listOnTimeout (timers.js:264:5)

I have installed ffmpeg, and set its path in environment variables. Also tried the same thing with avconv, but it makes no difference.

I'm on windows if it matters.

izy521 / discord.io

Trying to play a mp3 file, but it says I miss ffmpeg even though I have it #196