LDA topic modeling in R : error : Each row of the input matrix needs to contain at least one non-zero entry

Question

news_nov_lda<-LDA(news_nov_dtm2, k=18, seed=1234)

Error in LDA(news_nov_dtm2, k = 18, seed = 1234) : 
  Each row of the input matrix needs to contain at least one non-zero entry

So I tried

raw.sum=apply(news_nov_dtm2, 1, FUN = sum) news_nov_dtm2=table[raw.sum!=0,]

Error in table[raw.sum != 0, ] : object of type 'closure' is not subsettable

Help....