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Hi takayuki,
Just like the title, i am actually adding a plugin ‘hcaptcha’ into the site and when i click on the form’s submit button, i am seeing this error message:
PHP Fatal error: Class ‘WPCF7_Submission’ not found in …\plugins\hcaptcha-wordpress-plugin-1.4.2\cf7\hcaptcha-cf7.php on line 82.
Do you have any idea why is it so? i am using Contact Form Version 3.3.2 (and i am unable to upgrade to latest version due to hosting server limitation).
Thanks in advance!