R openNLP could not find function sentDetect()

R openNLP could not find function sentDetect()

I am using a few packages (webmining, sentiment, openNLP) to extract some
sentences about a stock JPM, but running in the following error:
Error in eval(expr, envir, enclos) : could not find function "sentDetect"
Here is the codes I used and I made sure that all packages are installed.
I checked the "corpus" variable and it is "a corpus with 20 text
documents". I also used "library(help=openNLP)" to list all the functions
in the package "openNLP" but did not find "sentDetect" in the list.
library(XML)
library(tm)
library(tm.plugin.webmining)
library(tm.plugin.sentiment)
library(NLP)
library(openNLP)
stock <-"JPM"
corpus <- WebCorpus(GoogleFinanceSource(stock))
sentences <- sentDetect(corpus)
Here is the running environment. Is it possibly related to the R 3.0.1
version (too new for openNLP) or 64-bit Windows system?
R version 3.0.1 (2013-05-16) -- "Good Sport" Copyright (C) 2013 The R
Foundation for Statistical Computing Platform: x86_64-w64-mingw32/x64
(64-bit)
Thank you very much.
Weihong