Array ( [ok] => [error] => method_deprecated [response_metadata] => Array ( [messages] => Array ( [0] => [ERROR] This method is retired and can no longer be used. Please use conversations.list or users.conversations instead. Learn more: https://api.slack.com/changelog/2020-01-deprecating-antecedents-to-the-conversations-api. ) ) ) Could not execute request channels.list