You can see on my blog, I give comments box with the verification code plugin, but encountered problems, named Problem:Unreadable CAPTCHA token .
Here are Three ways can solve it:
1st,using FTP tool landing site, through this path:
Give 777 permissions to this folder——”temp”.
2nd，Fast Secure Contact Form plugin will usually work just fine with the “Use CAPTCHA without PHP session” option disabled (as long as PHP sessions are working). Though fixing the folder permissions problem is recommended. If you can’t do that, then this option is your solution.
3rd，WordPress plugin SFC is not compatible with Small Resources For Money Maker. It can cause the error “Unreadable CAPTCHA token. CAPTCHA token file is missing.” And can cause the error “Attachment upload failed”. It is caused by the SFC plugin trying to scan the page content prior to WordPress showing it. This interferes with the proper posting of the form. The author of SFC has stated he will not make it congruent, but I suggested he could make a page exclusive feature so pages can be excluded from the SFC features. So far he has not made that feature.
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