[R] Warning for data.table (with ref)?

[Peng Yu]

I have following the message "dim(refdata) and dimnames(refdata) no
longer allow parameter ref=TRUE, use dim(derefdata(refdata)),
dimnames(derefdata(refdata)) instead" when I loaded data.table. Is it
from the package ref? Could it be fixed? Or there is something wrong
with my installation?

> library(data.table)
Loading required package: ref
dim(refdata) and dimnames(refdata) no longer allow parameter ref=TRUE,
use dim(derefdata(refdata)), dimnames(derefdata(refdata)) instead
> sessionInfo()
R version 2.10.0 (2009-10-26)
x86_64-unknown-linux-gnu

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C
 [3] LC_TIME=en_US.UTF-8        LC_COLLATE=en_US.UTF-8
 [5] LC_MONETARY=C              LC_MESSAGES=en_US.UTF-8
 [7] LC_PAPER=en_US.UTF-8       LC_NAME=C
 [9] LC_ADDRESS=C               LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] data.table_1.2 ref_0.97