SOLVED Problem with addon domain, 403 Forbidden error

Hello,
The url of my primary domain is example.gr and the url of my addon domain is domain.gr. Recently the addon domain stopped working, showing a 403 Forbidden error, "you don't have permission to access / on the server", or it redirected me to example.gr/domain.gr/, which by the way works properly.

I suspected it was my fault as i was messing up with .htaccess files, so I renamed both of them but with no luck. I even deleted my sitemap files.

Any suggestions of what may have gotten wrong?

Thank you in advance.

 

Thanks for the warning..
This is the error I am getting:

[Fri Feb 03 06:41:10.964774 2017] [autoindex:error] [pid 790669:tid 140534435759872] [client *****] AH01276: Cannot serve directory /home/example/home/example/public_html/domain.gr/: No matching DirectoryIndex (index.html.var,index.htm,index.html,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,index.shtml,default.htm,default.html,home.htm,index.php5,Default.html,Default.htm,home.html,welcome.html) found, and server-generated directory index forbidden by Options directive

 

Yes, that is the root for my addon domain.

 

Sorry for the late response,
You were right. It was a silly error at the document root of my addon domain. There was a double entry of my /home/example/ folder....
So everything is OK now. Thanks