The following is an excerpt from /Application/MAMP/htdocs/apache/httpd.conf :
# The following lines prevent .htaccess and .htpasswd files from being
# viewed by Web clients.
#
<em><FilesMatch "^\.ht">
Order allow,deny
Deny from all
Satisfy All
</FilesMatch>
<Files ~ "^\.DS_Store">
Order allow,deny
Deny from all
</Files></em>
I think it is self explanatory. The fact the it appears in the apache_error.log as an error it is a bit “overzealous”.