Blank page after install

Hello,
I have used the constrution-lite wordpess theme to create a site. It has worked on localhost perfectly but when I upload it on m web hostig, it sohows a blank page. I tried to do a clean install on the server and then add the theme and as soon as I activate it, it shows a blank page everywhere. But it works on localhost. I tried 2 different web hostings and the same problem occured. What could be wrong? Why does it work on my localhost and not on a web hosting?

Thanks in advance!