Here's your app hosted on my website: blackhornettechnologies.com/midi/pl1
It works, so this is something to do with wherever it is that you are hosting from. Looking back a few messages, you mention the error, which when I double check, looks like it actually is the console.log line causing the problem. This makes no sense to me, but I've removed all logging from my plugin and posted this one-off version here:
blackhornettechnologies.com/MIDI/bht_midi_nolog.zip
Replace the current files with these ones and see what happens.