sourcing .vimrc which includes either of two other plugins causes error with rails compiler

[lsiebert]

trafficstars

having either of these in my vimrc causes an error burnettk/vim-angular AndrewRadev/splitjoin.vim

error detected while processing rails#buffer_setup:

line 73 with neither commended out I get two of these, with one commented out I get one. No errors when I comment them out

E666 compiler not supported: rails

my vim version is macvim 7.4 patch 769, running mac os x yosemite

both plugins seem to be ruby based.

[tpope]

Do you have compiler/rails.vim? It ships with rails.vim but make sure it's present.