There is no main Rockbox build for the e200r - it uses the e200 build. So you need the voice files for the e200.
There appears to have been some confusion/bugs in the build system during the release, and an e200r voice file was created. You should ignore this file and use the e200 version.
Out of curiousity, how did you upgrade Rockbox? Did you use Rockbox Utility, or did you download and install the build and voice file manually?