Error with Mauntic integration

I have used this plugin to integrate with Mauntic. But there is an error. Here is a code of error:

Fatal error: Uncaught Mautic\Exception\IncorrectParametersReturnedException: Incorrect access token parameters returned: Array in /var/www/html/kulyk-wordpress/wp-content/plugins/wp-mautic-form-integrator/lib/Auth/OAuth.php:505 Stack trace: #0 /var/www/html/kulyk-wordpress/wp-content/plugins/wp-mautic-form-integrator/lib/Auth/OAuth.php(408): Mautic\Auth\OAuth->requestToken() #1 /var/www/html/kulyk-wordpress/wp-content/plugins/wp-mautic-form-integrator/wp-mautic-form-integrator.php(379): Mautic\Auth\OAuth->validateAccessToken() #2 /var/www/html/kulyk-wordpress/wp-content/plugins/wp-mautic-form-integrator/wp-mautic-form-integrator.php(473): haw_mautic_integration_get_forms_from_server(‘haw-mautic-inte…’) #3 /var/www/html/kulyk-wordpress/wp-includes/class-wp-hook.php(286): haw_mautic_integration_add_new(”) #4 /var/www/html/kulyk-wordpress/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array) #5 /var/www/html/kulyk-wordpress/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #6 /var/www/html/kulyk-wordp in /var/www/html/kulyk-wordpress/wp-content/plugins/wp-mautic-form-integrator/lib/Auth/OAuth.php on line 505