Fatal error: Uncaught exception

Hello, I’ve tried to use your plugin but I got this error: Fatal error: Uncaught exception 'Alchemy\Zippy\Exception\RuntimeException' with message 'Unable to execute the following command '/usr/bin/zip' '-r' '/tmp/wp-jekyll.zip' './' {output: }' in /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-exporter-master/vendor/alchemy/zippy/src/Adapter/ZipAdapter.php:80 Stack trace: #0 /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-exporter-master/vendor/alchemy/zippy/src/Adapter/AbstractAdapter.php(56): Alchemy\Zippy\Adapter\ZipAdapter->doCreate('/tmp/wp-jekyll....', Array, true) #1 /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-exporter-master/vendor/alchemy/zippy/src/Zippy.php(68): Alchemy\Zippy\Adapter\AbstractAdapter->create('/tmp/wp-jekyll....', Array, true) #2 /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-exporter-master/jekyll-exporter.php(333): Alchemy\Zippy\Zippy->create('/tmp/wp-jekyll....', Array, true) #3 /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-export in /home/qe87669/quartoestudio.com/wp-content/plugins/wordpress-to-jekyll-exporter-master/vendor/alchemy/zippy/src/Zippy.php on line 70 Any idea to solve this? Thanks! https://wordpress.org/plugins/jekyll-exporter/