R中data.table中的rbindlist出错

Question

尝试获取data.table时出现此错误。有办法解决吗？

 Error in FUN(X[[i]], ...) : 
  Expected sep (',') but new line, EOF (or other non printing character) ends 
  field 0 when detecting types from point 10: 

files=list.files(pattern="*csv")
prices = rbindlist(lapply(files, fread), fill=TRUE)