No hyphenation patterns were loaded for the language

http://tex.stackexchange.com/questions/1972/no-hyphenation-patterns-were-loaded-for-the-language

You may have to install spanish language support for TeX on your operating system. For instance, on Debian or Ubuntu it means to install texlive-lang-spanish I guess.

Afterwards it may be necessary to rebuilt the format files, for instance by

fmtutil --all

at the command prompt or the package manager of your TeX distribution.

I suggest you add some information to your question regarding operating system and TeX distribution.

However, this topic in the UK TeX FAQ may help you: Using a new language with Babel. It deals with this warning message and shows ways how to fix that.