Unknown column when reading in new csv-files

[RStudio-User]

For my project, I have to read in a bunch of csv-files. Therefore, I wrote a loop to read them. Furthermore, I need to change the encoding, because my datasets contain a lot of umlauts and other special characters. I use the following code:

read_data <- function(directory,debug=FALSE){
  file_list = list.files(path = directory,
                       pattern = "*.csv",
                       full.names = TRUE);

  df_read = data.frame();

  for (filename in file_list){
    df_temp = read.csv(filename,encoding="UTF-16LE", sep=";", header=TRUE);
    
    if(debug){
      print(paste0(c(filename, " : ", dim(df_temp))));  
    }
    
    df_read = rbind(df_read, df_temp);
    
  }
  
  names(df_read) = make.names(names(df_read))
  
  return(df_read)
}

Unfortunately, I get a spurious warning message:

Warning messages:
1: Unknown or uninitialised column: 'y'. 
2: Unknown or uninitialised column: 'y'. 
3: Unknown or uninitialised column: 'y'. 
4: Unknown or uninitialised column: 'y'. 

However, all my columns do have names. What does this error message mean and can I just ignore it or do I have to change something in my code?

[mattwarkentin]

Are you able to share the files? Also, if you expect each CSV to have the same columns, you can achieve the binding of CSV's in a simpler way using functionals:

file_list = list.files(path = directory,
                       pattern = "*.csv",
                       full.names = TRUE)

df <- purrr::map_dfr(file_list, ~read.csv(., encoding = "UTF-16LE", sep = ";", header = TRUE))