Critical error

Hi! Need some help. I just started my wordpress site and tried installing woocommerce but received the following message. Not sure what i can do. Spoke to hostinger, my webhost but they are not able to help and referred me here.

Fatal error: Uncaught Error: Class 'WC_Data' not found in /home/u495158269/domains/j-claire.com/public_html/wp-content/plugins/woocommerce/packages/woocommerce-admin/src/Notes/Note.php:15 Stack trace: #0 /home/u495158269/domains/j-claire.com/public_html/wp-content/plugins/jetpack/vendor/jetpack-autoloader/class-php-autoloader.php(87): require() #1 [internal function]: Automattic\Jetpack\Autoloader\jpf11009ded9fc4592b6a05b61ce272b3cjetpack\PHP_Autoloader::load_class('Automattic\\WooC...') #2 [internal function]: spl_autoload_call('Automattic\\WooC...') #3 /home/u495158269/domains/j-claire.com/public_html/wp-content/plugins/optinmonster/OMAPI/WooCommerce.php(542): class_exists('Automattic\\WooC...') #4 /home/u495158269/domains/j-claire.com/public_html/wp-includes/class-wp-hook.php(292): OMAPI_WooCommerce->maybe_store_note('') #5 /home/u495158269/domains/j-claire.com/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters(NULL, Array) #6 /home/u495158269/domains/j-claire.com/public_html/wp-includes/plugin.php( in /home/u495158269/domains/j-claire.com/public_html/wp-content/plugins/woocommerce/packages/woocommerce-admin/src/Notes/Note.php on line 15
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