Unable to load dse package in R

I am using R 2.11.1 on Windows Vista. When I try to load the package dse, the following error shows up:

Loa开发者_运维问答ding required package: dse
Error : object 'Tobs' not found whilst loading namespace 'dse'
Error: package 'dse' could not be loaded

Is this a known problem, or is there something I am missing?

As Nick Sabbe said, using the latest versions often works wonders.

Just for the record, the problem was probably trying to use a new version of dse with an old version of tframe. When I load dse I get

> library(dse)
Loading required package: tframe
Loading required package: setRNG

The news for dse says

Changes in dse version 2011.3-1

   o    Changed periods() and tfperiods() to Tobs() to be consistent with
    changes in tframe.

The news for tframe says

Changes in tframe version 2011.3-1

   o    Changed periods() and tfperiods() (distinction no longer needed) 
    to Tobs() to avoid conflicts with other packages.