# Error notification
The functions described in this document can only be used by corporate users who have submitted the required applications. To use it with your LINE Official Account, contact your sales representative or contact our Sales partners (opens new window).
The channel administrator receives a notification email if a problem occurs when the LINE Platform notifies the bot server of a webhook event. This optional function is called the "error notification" function.
# Notification email
This topic explains the email sent by the error notification function.
|Email recipients||An email is sent to the following email addresses.|
|Subject||Messaging API: Webhook transmission failed - |
|Where to find error information||One of the following "Notification contents" is described. For more information on errors, check the "Errors" tab of the "Statics" page in the LINE Developers Console.|
# Notification contents
|could_not_connect - (Connection failed: ||The LINE Platform could not connect to the webhook URL. A communication failure or a server outage might have occurred.|
|request_timeout - (Request timeout)||The bot server didn't return a response within a second. Processing such as replying to messages might have slowed down.|
|error_status_code - ( ||The bot server returned a response whose status was not 2xx.|
|unclassified||An error other than the above occurred.|