Reply by mail - Not Working

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I am trying to configure reply by email.

After using the reference guide to setup reply by mail. And checking the result with gitlab-rake gitlab:incoming_email:check I recieve an error (see below for check result)

gitlab.rb config

### Reply by email
###! Allow users to comment on issues and merge requests by replying to
###! notification emails.
###! Docs: https://docs.gitlab.com/ce/administration/reply_by_email.html
gitlab_rails['incoming_email_enabled'] = true

#### Incoming Email Address
####! The email address including the `%{key}` placeholder that will be replaced
####! to reference the item being replied to.
####! **The placeholder can be omitted but if present, it must appear in the
####!   "user" part of the address (before the `@`).**
gitlab_rails['incoming_email_address'] = "gitlab+%{key}@XXXXX.com"

#### Email account username
####! **With third party providers, this is usually the full email address.**
####! **With self-hosted email servers, this is usually the user part of the
####!   email address.**
gitlab_rails['incoming_email_email'] = "gitlab@XXXXXX.com"

#### Email account password
gitlab_rails['incoming_email_password'] = "XXXXXXXXX"

#### IMAP Settings
gitlab_rails['incoming_email_host'] = "imap.gmail.com"
gitlab_rails['incoming_email_port'] = 993
gitlab_rails['incoming_email_ssl'] = true
gitlab_rails['incoming_email_start_tls'] = false

#### Incoming Mailbox Settings
####! The mailbox where incoming mail will end up. Usually "inbox".
gitlab_rails['incoming_email_mailbox_name'] = "inbox"
####! The IDLE command timeout.
gitlab_rails['incoming_email_idle_timeout'] = 60

# Whether to expunge (permanently remove) messages from the mailbox when they are deleted after delivery
gitlab_rails['incoming_email_expunge_deleted'] = true

The following error occurs after checking the configuration with the gitlab-rake gitlab:incoming_email:check command

Check result

Checking Incoming Email ...

Incoming Email: ... Checking Reply by email ...

IMAP server credentials are correct? ... Exception: Tried to load unspecified class: Symbol
Init.d configured correctly? ... skipped
MailRoom running? ... skipped

Checking Reply by email ... Finished


Checking Incoming Email ... Finished