library(readxl)
library(plyr)
larquivos<-list.files("C:\Users\tomas.veiga\Documents\Financeiro\dados",full.names=TRUE)
arquivos <- lapply(larquivos, function(x) read_excel(path = x, sheet = 1))

extracontab<-data.frame(rbind.fill(arquivos[c(1:12)]))

Error in vector(type, length) :   vector: cannot make a vector of mode 'NULL'.

extracontab<-data.frame(rbind.fill(arquivos[c(1:12)]))