Console:
[create_data] Creating data.frame from colClasses
Warning in utils::read.table(text = "", colClasses = colClasses, col.names = col.names) :
cols = 0 != length(data) = 1

There is a problem in read_data:
colClasses is sent to create_data but it will always result in an empty df!!!
hence the test right after makes no sense

-- Init data

data <- create_data(colClasses)

# -- Check create.file argument
if(create){

  # -- Check dim!
  if(dim(data)[2] > 0)

The test delivered in #1 works only when the vector length is 1:
if(is.na(colClasses))

should be replaced by
if(anyNA(colClasses))