Have you tried change language settings on Tools->Settings ?
There's a section that says \usepackage{babel}
Maybe you could use \usepackage[spanish]{babel} (use your corresponding language)
or \selectlanguage{$$lang}
Hi, i have a problem when i try to use the command \usepackage[bottom]{footmisc} in the preamble. Lyx shows a message error with : Undefined control sequence
I don't know what could it be. I reinstalled the package and it follows showing the same error.