Rails邮件程序预览正确显示但发送电子邮件时出现未显示的方法错误

I'm pretty new to rails and have been following a few tutorials for sending email with Action Mailer. The application I am working on consists of adding repair tickets and sending an email notification to the customer when a button is clicked. I have been able to send emails when creating a new repair ticket but have run into issues when trying to send the email via a button. I would greatly appreciate any suggestions regarding this issue.I'm pretty new to rails and have been following