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I fixed the issue.

The root cause was that the app/code/MagePal/GmailSmtpApp-module wasn't updated when I used the web upgrade. My Magento-installation still contained old files. The error message is clear, one function / method missing (in the implementation of the abstract class). To fix this, I went ahead and thought I was replacing the old module with the new one (I used composer, composer require magepal/magento2-gmailsmtpapp, moved those files, and then used composer to remove it again, composer remove magepal/magento2-gmailsmtpapp).

What went wrong?

  • I copied the content of /GmailSmtpApp/* to /MagePal/. Instead, I should have copied the content of newmodulelocation/MagePal/* to /MagePal/
  • The old files were loaded and error still valid.

How to discover or debug a similar issue?

  • Search for some unique content of the first file. If found, investigate those files.
  • With linux-system, you search with the following command: sudo grep -r "Mail Transport"

Now, I only gothave other errors. I assume those are unrelated. If not, I'll come back.

I fixed the issue.

The root cause was that the app/code/MagePal/GmailSmtpApp-module wasn't updated when I used the web upgrade. My Magento-installation still contained old files. The error message is clear, one function / method missing (in the implementation of the abstract class). To fix this, I went ahead and thought I was replacing the old module with the new one.

What went wrong?

  • I copied the content of /GmailSmtpApp/* to /MagePal/. Instead, I should have copied the content of newmodulelocation/MagePal/* to /MagePal/
  • The old files were loaded and error still valid.

How to discover or debug a similar issue?

  • Search for some unique content of the first file. If found, investigate those files.
  • With linux-system, you search with the following command: sudo grep -r "Mail Transport"

Now, I only got other errors. I assume those are unrelated. If not, I'll come back.

I fixed the issue.

The root cause was that the app/code/MagePal/GmailSmtpApp-module wasn't updated when I used the web upgrade. My Magento-installation still contained old files. The error message is clear, one function / method missing (in the implementation of the abstract class). To fix this, I went ahead and thought I was replacing the old module with the new one (I used composer, composer require magepal/magento2-gmailsmtpapp, moved those files, and then used composer to remove it again, composer remove magepal/magento2-gmailsmtpapp).

What went wrong?

  • I copied the content of /GmailSmtpApp/* to /MagePal/. Instead, I should have copied the content of newmodulelocation/MagePal/* to /MagePal/
  • The old files were loaded and error still valid.

How to discover or debug a similar issue?

  • Search for some unique content of the first file. If found, investigate those files.
  • With linux-system, you search with the following command: sudo grep -r "Mail Transport"

Now, I only have other errors. I assume those are unrelated. If not, I'll come back.

1
source | link

I fixed the issue.

The root cause was that the app/code/MagePal/GmailSmtpApp-module wasn't updated when I used the web upgrade. My Magento-installation still contained old files. The error message is clear, one function / method missing (in the implementation of the abstract class). To fix this, I went ahead and thought I was replacing the old module with the new one.

What went wrong?

  • I copied the content of /GmailSmtpApp/* to /MagePal/. Instead, I should have copied the content of newmodulelocation/MagePal/* to /MagePal/
  • The old files were loaded and error still valid.

How to discover or debug a similar issue?

  • Search for some unique content of the first file. If found, investigate those files.
  • With linux-system, you search with the following command: sudo grep -r "Mail Transport"

Now, I only got other errors. I assume those are unrelated. If not, I'll come back.