r - Document Term Matrix throwing error: Error in simple_triplet_matrix -


i creating word cloud based on tweets various different sports teams. code executes 1 in 10 times: 

library(tm) library(snowballc)  twt.mumbai <- searchtwitter('mumbai',n=50, lang = "en") twt.london <- searchtwitter('london',n=50, lang = "en")  save(list="twt.mumbai", file="mumbai.rdata") save(list="twt.london", file="london.rdata")  load(file = "mumbai.rdata") load(file = "london.rdata")  tweets.mumbai <- lapply(twt.mumbai, function(t) {t$gettext()}) tweets.london <- lapply(twt.london, function(t) {t$gettext()})  data.sourcem <- vectorsource(tweets.mumbai) data.sourcel <- vectorsource(tweets.london)  data.corpusm <- corpus(data.sourcem) data.corpusl <- corpus(data.sourcel)  #preprocessing #removepunctuation data.corpusm <- tm_map(data.corpusm, content_transformer(removepunctuation), lazy = true) data.corpusl <- tm_map(data.corpusl, content_transformer(removepunctuation), lazy = true)  #urlremove removeurl <- function(x) gsub("http[^[:space:]]*", "", x) data.corpusm <- tm_map(data.corpusm, content_transformer(removeurl), lazy = true) data.corpusl <- tm_map(data.corpusl, content_transformer(removeurl), lazy = true)  #removenumber data.corpusm <- tm_map(data.corpusm, removenumbers, lazy = true) data.corpusl <- tm_map(data.corpusl, removenumbers, lazy = true)  #extrawhitespace data.corpusm <- tm_map(data.corpusm, stripwhitespace, lazy = true) data.corpusl <- tm_map(data.corpusl, stripwhitespace, lazy = true)  #stem data.corpusm <- tm_map(data.corpusm, content_transformer(stemdocument), lazy = true) data.corpusl <- tm_map(data.corpusl, content_transformer(stemdocument), lazy = true)  inspect(data.corpusm[1:2]) inspect(data.corpusl[1:2])  tdm.mumbai <- documenttermmatrix(data.corpusm, control = list(stemdocument=true)) tdm.london <- documenttermmatrix(data.corpusl, control = list(stemdocument=true))

the document term matrix throwing following error: error in simple_triplet_matrix(i = i, j = j, v = as.numeric(v), nrow = length(allterms), : 'i, j, v' different lengths in addition: warning messages: 1: in mclapply(unname(content(x)), termfreq, control) : scheduled cores encountered errors in user code 2: in simple_triplet_matrix(i = i, j = j, v = as.numeric(v), nrow = length(allterms), : nas introduced coercion


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