there is an error about 'on' function

[yj9404]

hello, i run at aws lambda but i got an error like this

"errorType": "TypeError",
"errorMessage": "Cannot read property 'on' of undefined",
"stack": [
"TypeError: Cannot read property 'on' of undefined",
" at module.exports (/var/task/src/runner.js:45:15)",
" at Runtime.exports.handler (/var/task/index.js:18:5)",
" at Runtime.handleOnce (/var/runtime/Runtime.js:66:25)",
" at process._tickCallback (internal/process/next_tick.js:68:7)"
]