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Which error? Could you explain further?

Try to activate the plugins one by one, in order to better identify which one may be the culprit.
However you must remove plugins like Google AdSense by BestWebSoft, since you are not allowed to put...

The problem is more likely caused by a plugin, could you please provide a list of the ones you have active on your blog?
Also, post here the content of the .htaccess file.