I just changed the folder permissions to 0733 on the temp folder it mentions
/si-captcha-for-wordpress/captcha/temp/
UPDATE:
I just changed the folder permissions to 0733 on the temp folder it mentions
/si-captcha-for-wordpress/captcha/temp/
UPDATE:
Your comment ERROR: Could not read CAPTCHA token file. How we can solve?
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Problem: Could not read CAPTCHA token file