Internal server error-can't use the plugin

Hi,

I have a problem using this plugin in one of my websites. I use it on several other places but cant use it on one website which is hosted on digital ocean.

No styles,images or js being loaded, so I cant do anything, see the screenshot here:

https://www.dropbox.com/s/grrhttu62j2a7po/Screenshot%202015-11-11%2020.07.38.png?dl=0

Any suggestions how to fix this?

(probably something something in .htaccess file but I would like to know what exactly what)

Thanks

https://www.ads-software.com/plugins/adsense-now-lite/