Call to undefined method app mail mailtoadmin via

A Ruby on Rails error!

The error message "call to undefined method app_mail" indicates that you're trying to call a method named app_mail on an object, but that method doesn't exist.

In this specific case, the error is occurring in the mailtoadmin method, which is trying to call app_mail. This suggests that mailtoadmin is a method that's supposed to send an email, but it's not finding the app_mail method to do so.

Here are a few possible solutions:

1. Check your code: Make sure you have a method named app_mail defined somewhere in your code. If you're using a gem like Action Mailer, you might need to define a method with that name in your ApplicationMailer class.
2. Check your dependencies: Ensure that you have the necessary dependencies installed, including Action Mailer. You can check your Gemfile and run bundle install to ensure everything is up to date.
3. Check your routes: Verify that you have a route set up for the mailtoadmin method. You can do this by running rails routes in your terminal. If the route is not found, you'll need to add it to your routes.rb file.
4. Check your mailer class: If you're using Action Mailer, make sure you have a mailer class defined (e.g., ApplicationMailer) and that it's correctly configured.

If none of these solutions work, please provide more code context or details about your project, and I'll do my best to help you troubleshoot the issue!