Github slack could not find resource

Describes the cause and action for error messages.

Error Message(English)：
slack could not find resource

Resolution

integrations/slack - GitHub
https://github.com/integrations/slack/issues/341

integrations/slack - GitHub
https://github.com/integrations/slack/issues/260

integrations/slack - GitHub
https://github.com/integrations/slack/issues/315

GitHub と Slack を連携させる ? Slack
https://get.slack.help/hc/ja/articles/232289568-GitHub-%E3%81%A8-Slack-%E3%82%92%E9%80%A3%E6%90%BA%E・・・

接続問題のトラブルシューティング ? Slack
https://get.slack.help/hc/ja/articles/205138367-%E6%8E%A5%E7%B6%9A%E5%95%8F%E9%A1%8C%E3%81%AE%E3%83%・・・

SlackのGitHub連携をやめGitHub->AmazonSNS->Lambda ... - Qiita
https://qiita.com/ooharabucyou/items/2a3dca643f6b7783d665

[GAS] GoogleAppsScriptでGitHubの通知をSlackのDMに投稿するように ...
https://qiita.com/mikan3rd/items/30ac861df31756722ad5

New improvements to the Slack and GitHub integration - The GitHub ...
https://github.blog/2018-05-17-new-improvements-to-slack-and-github-integration/

Community resources - Slack API
https://api.slack.com/community