Can't find stylesheets and rake fine_print:copy:stylesheets not working

[amvaleh]

Hi,
I just installed this gem, I changed FinePrint configuration file and set config.layout = 'landings' which is one of my simple layouts.
When I open the admin panel, the CSS files are not loaded, there is no style in admin panel.
When I run rake fine_print:copy:stylesheets according to gem README, I get following error:
Don't know how to build task 'fine_print:copy:stylesheets' (See the list of available tasks with rake --tasks)
I searched in app folder of Gem, but I couldnt find any css or js files.

Could you please help me ?
thanks.