How to upgrade OroCommerce 3.1 to 4.1

I'm upgrading an OroCommerce installation from version 3.1.17 to 4.1.1.

I've upgraded php to 7.3.15 and I'm going through the upgrade instructions in a VM.

When I run the command sudo php bin/console oro:platform:update --env=prod --force I get this message:

In OroEntityExtendBundle.php line 121:

  In ContainerBuilder.php line 1032:                     

    You have requested a non-existent service "mail".

Any ideas? Thanks

Solution

Please follow the changelog.md to see all the changes that the customization can be affected with.

Here is the related paragraph:

Due to the updated version of symfony/swiftmailer-bundle parameter mailer_transport: mail is not supported anymore. Using old transport will cause such an exception

Unable to replace alias “swiftmailer.mailer.default.transport.real” with actual definition “mail”. You have requested a non-existent service “mail”.

Please use mailer_transport: sendmail instead or another available swiftmailer transport type.

https://github.com/oroinc/platform/search?l=Markdown&q=mail%20sendmail