500 Internal server error…….

I have visited my File Manager folder.
Inside the public_html, i saw a folder offtopics is created. But, I didn’t find anything inside.
May be that is a problem. But, I had prepared the multisite as directed in the tutorial.

Should I have to install wordpress inside that folder again? If yes then I didn’t configure multisite correctly as the aim of multisite is not installing wordpress again and again.
And, if not, then what could be the further step to get rid with this error?

Thank you very much again.

Instead of deleting, I just renamed the folder offtopics to something other and now again 500 Internal Server Error.

I actually didn’t know how could I help yo to make my problem understand.

I actually don’t know about the kind of panel I have.

I don’t think, I have created any subdomain in my server.

My original site http://www.sukajee.com was going well. I just wanted to create another website http://www.offtopics.sukajee.com
I can do it by installing wordpress again. But, I was in search of the way to do the same thing without installing wordpress.
While visiting many threads and manywhere, I found the wordpress support page for multisite – http://codex.ww.wp.xz.cn/Create_A_Network

I just followed whatever instruction is given there.
After completing the process, I saw My Sites menu in my dashboard.
I just entered into Sites submenu from Network Admin menu.
Then I just added a new site ‘offtopics’
The screenshot seems like this.
https://www.facebook.com/photo.php?fbid=10200292771880483&set=a.1219342302237.25726.1789306442&type=1&theater

That’s all I did. I didn’t do anything in server or cpanel.
Then after I saw a folder ‘offtopics’ in public_html.

Now, Please suggest me where is my mistake. What is now to do?

I couldn’t get anything from that page too.

I think, I am too much child for this task. Although, I couldn’t get success what I want to get in, many others might get help from this thread.

Thank you Mika for the help.