no such file or directory - datetimepicker.css - css

I'm trying to include in my rails application a date time selector, looking around I found this: http://www.malot.fr/bootstrap-datetimepicker/index.php
but when I try to compile it I get the following error:
$lessc build/build_standalone.less datetimepicker.css
/usr/local/rvm/gems/ruby-2.0.0-head/gems/less-2.3.2/bin/lessc:100:in `read': No such file or directory - datetimepicker.css (Errno::ENOENT)
from /usr/local/rvm/gems/ruby-2.0.0-head/gems/less-2.3.2/bin/lessc:100:in `<top (required)>'
from /usr/local/rvm/gems/ruby-2.0.0-head/bin/lessc:23:in `load'
from /usr/local/rvm/gems/ruby-2.0.0-head/bin/lessc:23:in `<main>'
I'm not too fresh with less could you please help me solve this?
the os is mac os 10.8.4
thanks,

solved:
the second parameter was not pointing correctly to the css file.
the correct commandline is :
$lessc build/build_standalone.less css/datetimepicker.css
thanks :)

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enter image description here
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