Plugin conflict with Gmail SMTP

I have the same issue: W3 Total Cache 0.9.5 is active. When trying to activate de Gmail SMTP plugin I get the following error:

Warning: require(/home/kiska271/public_html/wp-content/plugins/w3-total-cache/lib/Google/Service/Gmail.php): failed to open stream: No such file or directory in /home/kiska271/public_html/wp-content/plugins/w3-total-cache/w3-total-cache-api.php on line 143

I’m getting the same problem:
Warning: require(/home/75505-59015.cloudwaysapps.com/zjrxagkbny/public_html/wp-content/plugins/w3-total-cache/lib/Google/Service/Gmail.php): failed to open stream: No such file or directory in /home/75505-59015.cloudwaysapps.com/zjrxagkbny/public_html/wp-content/plugins/w3-total-cache/w3-total-cache-api.php on line 143

Does deactivating W3 Total Cache cause issues?

The issue lies in the new way W3TC loads files. It checks for the class name and my guess is that the class used in the GMAIL SMTP plugin starts with Google_ and thereby triggering W3TC class loading functionality.

Yep, I’m getting the same error when the WP-Mail-SMTP plugin is activated. I had to go through cPanel and rename the w3-total-cache plugin folder to get the WP admin area to work, again.

No fixes yet?

Any update on this?

A temporary workaround would be copy/paste the Gmail.php from Google API library to wp-content/plugins/w3-total-cache/lib/Google/Service so it will not throw an Error.

• This reply was modified 8 years, 2 months ago by Agli Pan?i.

I was getting the same fatal error.

I found a temporary solution(?) here, and it seems that the issue has been solve in an update.