Errors when I create webhook for line

When I create webhook for line always errors.
The url of webhook show this messages:
Function ‘generalResponse’ finished with error! Cannot read properties of undefined (reading ‘forEach’)

I try again and again
It still don’t work
please help me

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It’s a normal operation what I ever did it success, but now it can’t success anymore.

I try to make a Line Bot
step1. I make a Line > Watch Evenet, so it automatically create a connection and webhook.
pic1

step2. I follow the guidline copy the webhook url to line developer console, after I Verify the Url but it doesn’t work.
pic2

step3. I go back to the pages of webhook, when I test the webhook url, it show the errors.
pic 3