Error: You need to set a valid value for "verifyToken" in data/global/config/channel-messenger.json

Channel misconfigured [Error, You need to set a valid value for “verifyToken” in data/global/config/channel-messenger.json]
STACK TRACE
Error: You need to set a valid value for “verifyToken” in data/global/config/channel-messenger.json
at MessengerService.initialize (D:\botpress-v12_15_2-win-x64\modules\channel-messenger\dist\backend\messenger.js:48:13)
at async Object.onServerReady (D:\botpress-v12_15_2-win-x64\modules\channel-messenger\dist\backend\index.js:18:5)

Hey @Amna_Jabbar

You need to duplicate the channel-messenger config file into your chatbot (this can be done using the Code Editor) and paste your verifyToken value in the config file.

More information can be found here.

how to know my verify token value?

Instructions can be found here Facebook Messenger · | Developer's Guide