Hi @tatsuya.nakamura and @ian3,
Thank you for reaching out. 
Can you please tell us if the error is still present? If yes, kindly share a screenshot or screencast recording from your Browser console with the error message and plugin configuration in your editor.
Today, the Dev team has resolved the issue on the Heroku service side that might be affected by this plugin functionality as well.
Please check and let us know if the issue is resolved and if the plugins are functioning as expected.
Wishing you a great Tuesday. Once again, we apologize for any inconvenience this may have caused.
Best regards,
Support Team
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