Plugin conflict with w3 total cache

Cant activate the plugin while w3 total cache v0.9.5 is active.

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

Fatal error: require(): Failed opening required 'htdocs/wp-content/plugins/w3-total-cache/lib/Google/Service/Gmail.php' (include_path='.:/usr/share/php') in htdocs/wp-content/plugins/w3-total-cache/w3-total-cache-api.php on line 143