r - error unlisting result of lapply -

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i have run lapply like:

paper_author_name<-lapply(train_author,function(x){   as.data.frame(paper_author$author_name[which(paper_author$author_id%in%x)]) })

i getting result as:

 [[1]] paper_author$author_name[which(paper_author$author_id %in% x)]                                              emanuele buratti                                              emanuele buratti                                              abdiub bahir

now need unlist result by

unlist(paper_author_name[1])

but getting error 

error in structure(res, levels = lv, names = nm, class = "factor") :  'names' attribute [135] must same length vector [1]

how unlist result.

thanks


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