When I installed joomlacomment visualized the same mistake ...
...
There was a problem with your installation
error when moving /home/ascrifo/public_html/administrator/components/com_comment/plugin/joscomment.php
TO /home/ascrifo/public_html/plugins/content/joscomment.php
Please, contact the support.
Thanks.
error when moving /home/ascrifo/public_html/administrator/components/com_comment/plugin/joscomment.xml
TO /home/ascrifo/public_html/plugins/content/joscomment.xml
error when moving /home/ascrifo/public_html/administrator/components/com_comment/plugin/josccleancache.php
TO /home/ascrifo/public_html/plugins/system/josccleancache.php
error when moving /home/ascrifo/public_html/administrator/components/com_comment/plugin/josccleancache.xml
After this error I moved the files that appeared in the error message via the CPANEL and component worked corertamente.
I noticed that there is an almost complete translation for my language is the Portuguese of Brazil, I am available to administrators to help translate, to contact by e-mail.
I hope I have helped someone
