Problem creatin subdomain: I am getting no index.php found & 404 error

Hi. I am having troubles for creating a subdomain for my site tuweba100.com. It is set up as a Subdomain based multisite. I have succesfully created a subdomain here http://cafetraviesas.tuweba100.com/ by going in the Super Admin Dashboard to Sites > Add New and entering the name & admin email; and then going to my cpanel and adding an addon domain... I have checked the A reccords and those match the A reccords of every other site in my host and form my root site. I don'nt know which the problem is, but when trying to load the new site hotel-cais.tuweba100.com; I keep having the following error message:
<<
Not Found
The requested URL /index.php was not found on this server.
Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.
>>

Please, help me. I don't know what is going on!
Pablo