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Please note, that here we only support Paid Addons issues and questions.
gVectors Support staff works from 6am to 6pm (GMT+0)
All questions related to wpForo and wpDiscuz free plugins should be asked in the corresponding plugin support forum:
Error with Captcha
It seems you're using some additional reCAPTCHA plugins. Please try to deactivate all other reCAPTCHA plugins and check again.
I have deaktivatet the Google reCaptcha Plugin.
wpDiskus shows the same error without Captcha