See the reproducer in 4459. The four error messages are generated, but this does not stop the build process. bitbake should exit.
Patches on bitbake mailing list to resolve this.
Fixed in master with http://git.yoctoproject.org/cgit.cgi/poky/commit/?id=3c5b9cf15f2034b704f571a75ad102cc57f9a3b6