Fatal error

Good afternoon,
I need help with your plugin.
When I activave your plugin, I have a fatal error.

Configuration
Hosting > OVH
PHP Version > 7.0
MySql version > 5.6
Contact form version > 4.7

<blockquote>Warning: include(/home/xxx/dev/wp-content/plugins/forms-to-sendinblue/includes/class-ftosb-SENDINBLUE.php): failed to open stream: No such file or directory in /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php on line 197

Warning: include(/home/xxx/dev/wp-content/plugins/forms-to-sendinblue/includes/class-ftosb-SENDINBLUE.php): failed to open stream: No such file or directory in /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php on line 197

Warning: include(): Failed opening '/home/xxx/dev/wp-content/plugins/forms-to-sendinblue/includes/class-ftosb-SENDINBLUE.php' for inclusion (include_path='.:/usr/local/php7.0/lib/php') in /home/eklamaisah/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php on line 197

Fatal error: Uncaught Error: Class 'Forms_To_SendinBlue_SendinBlue' not found in /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php:215 Stack trace: #0 /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php(102): Forms_To_SendinBlue->init_classes() #1 /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php(84): Forms_To_SendinBlue->init_plugin() #2 /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php(65): Forms_To_SendinBlue->__construct() #3 /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php(278): Forms_To_SendinBlue::init() #4 /home/xxx/dev/wp-admin/includes/plugin.php(1909): include('/home/xxx...') #5 /home/xxx/dev/wp-admin/plugins.php(172): plugin_sandbox_scrape('forms-to-sendin...') #6 {main} thrown in /home/xxx/dev/wp-content/plugins/forms-to-sendinblue/forms-to-sendinblue.php on line 215</blockquote>

Thank you for your help.

Best regards,
Nicolas