That is an error stating that a plugin you have installed on your Wordpress named 'twitter-mentions-as-comments' is malfunctioning. It is trying to find a file on line 40 of the twitter-mentions-as-comments.php file and cannot do so, so it is complaining.
If this is hindering your admin login, you will want to disable the plugin manually by logging into the cPanel File Manager, then navigating to the /home/hsyste5/public_html/blog/wp-content/plugins directory. Once there, I would rename the twitter-mentions-as-comments folder until you can troubleshoot the plugin. The best thing to do for that is to consult the plugin author's website to see if they have a bug report and/or fix on the site.
Disabling the plugin should allow you to log into the site admin area.
I hope this answers your question. If you have any more questions or information specific to the issue please leave a comment below so we can further assist you.
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