Fatal Error when activating

I have used this plugin numerous times in the past and have never encountered this error when trying to activate. Any advice or direction will be appreciated. Full error log below:

( ! ) Fatal error: Cannot redeclare class Google_Client in /home/the1926/public_html/bellferris/wp-content/plugins/cf7-google-sheets-connector/lib/php-google-oauth/Google_Client.php on line 68
Call Stack
# Time Memory Function Location
1 0.0011 445296 {main}( ) …/plugins.php:0
2 0.7416 72405120 plugin_sandbox_scrape( ) …/plugins.php:164
3 0.7421 72473784 include( ‘/home/the1926/public_html/bellferris/wp-content/plugins/cf7-google-sheets-connector/google-sheet-connector.php’ ) …/plugin.php:1882
4 0.7444 72669792 require_once( ‘/home/the1926/public_html/bellferris/wp-content/plugins/cf7-google-sheets-connector/lib/php-google-oauth/Google_Client.php’ ) …/google-sheet-connector.php:36