xtne6f氏版 + Material_WebUIで localhost:5510/onair.html　にアクセスするとエラー出ちゃうんだけどどうすればいい？

C:\Users\********\Documents\EDCB\HttpPublic/onair.html:146: attempt to index global 'next' (a nil value)
stack traceback:
[string "mg.write(debug.traceback(), '\n')"]:1: in main chunk
[C]: in function '__index'
C:\Users\********\Documents\EDCB\HttpPublic/onair.html:146: in main chunk