R help - Apr 2014 - Error object .Source not found when using package tm.plugin.webmining

I don't understand this error or how to resolve it.

Error in get(name, envir = asNamespace(pkg), inherits = FALSE) :
  object '.Source' not found

Using R version 3.1.0 beta (2014-03-28 r65330) -- "Spring Dance"

##### output from console ######
> library(quantmod)
Loading required package: Defaults
Loading required package: xts
Loading required package: zoo

Attaching package: 'zoo'

The following objects are masked from 'package:base':

    as.Date, as.Date.numeric

Loading required package: TTR
Version 0.4-0 included new data defaults. See
?getSymbols.
> library(rJava)
> library(boilerpipeR)
> library(namespace)
> library(tm.plugin.webmining)
Loading required package: tm
Loading required package: RCurl
Loading required package: bitops

Attaching package: 'RCurl'

The following object is masked from 'package:rJava':

    clone

Loading required package: XML

Attaching package: 'tm.plugin.webmining'

The following object is masked from 'package:RCurl':

    getURL

The following object is masked from 'package:base':

    parse
>
> corpus <- WebCorpus(GoogleFinanceSource("NASDAQ:MSFT"))
Error in get(name, envir = asNamespace(pkg), inherits = FALSE) :
  object '.Source' not found

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