Autoindex:error

We are getting hundreds of these errors… [autoindex:error] [pid 38087] [client **.***.***.*:57336] AH01276: Cannot serve directory /home/*****/public_html/wp-content/plugins/onesignal-free-web-push-notifications/sdk_files/: No matching DirectoryIndex (index.html.var,index.htm,index.html,index.shtml,index.xhtml,index.wml,index.perl,index.pl,index.plx,index.ppl,index.cgi,index.jsp,index.js,index.jp,index.php4,index.php3,index.php,index.phtml,default.htm,default.html,home.htm,index.php5,Default.html,Default.htm,home.html) found, and server-generated directory index forbidden by Options directive

just started today… annoying