error in upgrade

[blind564]

i had smf 1.1.13 y upagrade to 2 rc5 when i was intalling appear me this error

The upgrader found some old or outdated language files, for the forum default language, spanish.

Please make certain you uploaded the new versions of all the files included in the package, even the theme and language files for the default theme.

someone have idea whats mean?

[Illori]

remove your spanish language files from the themes/default/languages folder. you will need new ones anyway to get them to work with the new version.