Fiori launchpad web dynpro java

Hi

I have activated the fiori launchpad in my portal but the webdynpro java appllications don´t get the correct CSS. There is a 404 not found resource:

https://myportal/com.sap.portal.design.urdesigndata/themes/portal/sap_bluecrystal/ls/ls_standards.css

Is there any problem with the theme? what theme must I use?

Thanks