Unable to install vim plugins

I am unable to install any vim plugins on nixOS

running the command:

nix-env -i vimplugin-Syntastic

gives these as the last 3 lines of output:

output path ‘/nix/store/3bcdjr4hwgrimcimdg2115prpfm83xca-syntastic-4782184’ should 
have r:sha256 hash ‘1vjh3a3w6whvaws86z48j8bp7dgavvix8a2kgjn195axs83hpkxy’, instead has 
‘01a1px7i77ajc4y8czwhkhhqif89q6yf26wpjakh3asdv7cvnidm’

cannot build derivation ‘/nix/store/478msfr0bm6h64zp0ri5c98dgkp4zrcd-vimplugin-
Syntastic-2015-02-17.drv’: 1 dependencies couldn't be built

error: build of ‘/nix/store/478msfr0bm6h64zp0ri5c98dgkp4zrcd-vimplugin-Syntastic-2015-02-17.drv’ failed

All the other output appears normal until these last lines. I'm having the exact same problem with other vim plugins, i've tried 4 other plugins:

Solarized
Nerd commenter
airline
ctrp