Post the logs in /core/logs/error.tdata and let's see if I can help you.
Be careful because every time you use the article-rewriter tool your site will link to api.prothemes.biz and send a lot of your data. So I suggest you, before using it, to access the administrative area and click "SEO Tools => Additional option" and under "Select Plagiarism Checker Method" select "Google Search Engine" or "Google CSE Method".
Be careful because every time you use the article-rewriter tool your site will link to api.prothemes.biz and send a lot of your data. So I suggest you, before using it, to access the administrative area and click "SEO Tools => Additional option" and under "Select Plagiarism Checker Method" select "Google Search Engine" or "Google CSE Method".