emerge: there are no ebuilds to satisfy

I had the following message when I executed emerge -p world :

emerge: there are no ebuilds to satisfy "sys-kernel/gentoo-sources:3.10.32". (dependency required by "@selected" [set]) (dependency required by "@world" [argument]) 
emerge: there are no ebuilds to satisfy "sys-kernel/gentoo-sources:3.12.13". (dependency required by "@selected" [set]) (dependency required by "@world" [argument])

The solution is to remove ebuild from world file :

emerge --deselect sys-kernel/gentoo-sources:3.10.32

Thanks to mackal for the solution
See the post message on Gentoo forum : https://forums.gentoo.org/viewtopic-t-998826-highlight-.html