Error when I try to install the spanish language

[OlgaRH78]

I have done an installation of Joomla 2.5 beside Virtue Mart 2.6.0. Then I have installed the package with spanish language....but when I try to configure VirtueMart...an error appears: "It is not the flag es-ES, for the language es-ES"....What am I doing badly?

[jjk]

"It is not the flag es-ES, for the language es-ES"....What am I doing badly?

Is the above error message translated from Spanish?
I suppose you have to go to your Joomla language manager, click on the 'Content' tab and add the spanish language tags there (similar to the ones you will see for the english language, but 'es' and 'es-ES' instead of 'en' and 'en-GB'.