[Koha] new to koha

[etaisil ineseliam]

Im new to Koha and after installation I get this message on the browser
when i try to load the opac site

  System maintenance

The Koha online catalog is offline for system maintenance. We'll be back
soon! If you have any questions, please contact the site administrator
  I have disabled default site, and restart apache but browser still shows
this error. what to I have to do here? oh and the intra site does not load
anything