R help - Feb 2016 - Need your favour : twitter sentiment issue while cleaning the corpus

Hi,
I need your favour. I received below warning while cleaning the corpus of tweets
which is not allowing me to further the analysis:

Warning message:
In mclapply(content(x), FUN, ...) :
  scheduled core 1 encountered error in user code, all values of the job will be
affected

Code used: for cleaning. 
tw_clean <- tm_map(tw_corpus, removePunctuation)
tw_clean <- tm_map(tw_clean, content_transformer(tolower))
tw_clean <- tm_map(tw_clean, removeWords, stopwords('english'))
tw_clean <- tm_map(tw_clean, removeNumbers)
tw_clean <- tm_map(tw_clean, stripWhitespace)

Code used to create the corpus:
tw_corpus <- Corpus(VectorSource(tw_text))

The error is raised for each of the above line of code. 

I some how found a way to ignore the error/warning message by including
?lazy=TRUE? argument in the tm_map() function
but when attempted to view the wordcloud(tw_clean)  below error is raised with
the same warning.

Error in UseMethod("meta", x) : 
  no applicable method for 'meta' applied to an object of class
"try-error"

In addition: Warning message:
In mclapply(unname(content(x)), termFreq, control) :
  scheduled core 1 encountered error in user code, all values of the job will be
affected

Regards,
Sunny Singha
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Hi,
In continuation to my initial mail I also observed that as I include more number
of tweets, the likelihood of getting this error increases.

Platform I?m using:
- Mac Yosemite
- R version 3.2.2(RStudio) 

I have below questions:
- Does this error has to do anything with the default locale set in R session? I
have had it set from Mac terminal ?defaults write org.R-project.R force.LANG
en_US.UTF-8?
- Before creating the Corpus() I had the tweets converted to character by using
this command tw_text <- sapply(tw, function(x) x$getText()). Is it the
recommended approach ?

How should I go about getting this issue resolved ?

Regards,
Sunny Singha

> On 16-Feb-2016, at 5:22 PM, Sandeep Rana <sunnysingha.analytics at
gmail.com> wrote:
> 
> Hi,
> I need your favour. I received below warning while cleaning the corpus of
tweets which is not allowing me to further the analysis:
> 
> Warning message:
> In mclapply(content(x), FUN, ...) :
>   scheduled core 1 encountered error in user code, all values of the job
will be affected
> 
> Code used: for cleaning. 
> tw_clean <- tm_map(tw_corpus, removePunctuation)
> tw_clean <- tm_map(tw_clean, content_transformer(tolower))
> tw_clean <- tm_map(tw_clean, removeWords, stopwords('english'))
> tw_clean <- tm_map(tw_clean, removeNumbers)
> tw_clean <- tm_map(tw_clean, stripWhitespace)
> 
> Code used to create the corpus:
> tw_corpus <- Corpus(VectorSource(tw_text))
> 
> The error is raised for each of the above line of code. 
> 
> I some how found a way to ignore the error/warning message by including
?lazy=TRUE? argument in the tm_map() function
> but when attempted to view the wordcloud(tw_clean)  below error is raised
with the same warning.
> 
> Error in UseMethod("meta", x) : 
>   no applicable method for 'meta' applied to an object of class
"try-error"
> 
> In addition: Warning message:
> In mclapply(unname(content(x)), termFreq, control) :
>   scheduled core 1 encountered error in user code, all values of the job
will be affected
> 
> Regards,
> Sunny Singha

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