Error in debug true

Hi, my name luigi from italy .. i have installed plugin in mode debug = true .. result errors:

Warning: explode() expects parameter 2 to be string, array given in D:\www\mywebsite\wp-content\plugins\invisible-recaptcha\engine\Modules\ContactForms\ContactFormsAdminModule.php on line 57

Warning: array_map(): Argument #2 should be an array in D:\www\mywebsite\wp-content\plugins\invisible-recaptcha\engine\Modules\ContactForms\ContactFormsAdminModule.php on line 58

Warning: Invalid argument supplied for foreach() in D:\www\mywebsite\wp-content\plugins\invisible-recaptcha\engine\Modules\ContactForms\ContactFormsAdminModule.php on line 59

Warning: array_values() expects parameter 1 to be array, null given in D:\www\mywebsite\wp-content\plugins\invisible-recaptcha\engine\Modules\ContactForms\ContactFormsAdminModule.php on line 66

Warning: Cannot modify header information - headers already sent by (output started at D:\www\mywebsite\wp-content\plugins\invisible-recaptcha\engine\Modules\ContactForms\ContactFormsAdminModule.php:57) in D:\www\mywebsite\wp-includes\pluggable.php on line 1179

how to solution problem?

Thanks!.