Warning message when using lmer function

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

I got the following warning message when using the lmer function. 
Does anyone know what is the implication? Thanks!

Warning message: In anova(model, ddf = "lme4") : bytecode version
mismatch; using eval

_______________________________________________ 
R-sig-mixed-models at r-project.org mailing list 
https://stat.ethz.ch/mailman/listinfo/r-sig-mixed-models

Have you made sure that you've re-installed lme4 and lmerTest since
the last time you updated R?

https://stat.ethz.ch/pipermail/r-help/2011-November/294486.html
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)

iQEcBAEBAgAGBQJVdyocAAoJEOCV5YRblxUHwxUIALbCBUh5RBrPpXWG6Hx6ErWV
NP9/vIq+XiP1yTbCHv7GPF+stySUJuE8KBZ9k7pYrHqmknmp/Os4fKMq+UO6TI/V
8AsYb1Qf3wTThHiJYukGMDYX+pmsRPpFq8qYaIcO4P4dJtqhX2AZmWazFrpIP4Ap
w0sb7Du7SBtccFZKq/ETsEyyVGWSM8txv6LigMCs5ZYWtAL4C6YUkDdmjM8l0OQz
H9w+IV5RIahyTu1dYbZRjaZ2ubapQej42MyZkwyBVSF/9UAyFkkaHijE8E/bD/so
BeE6QF+RbIm4JsUH2izsfVHgLI59FFnP7TxmbLSPmqHUvq2bcbforh+OQt1J+Ts=
=Ue3Y
-----END PGP SIGNATURE-----