OpenCSV: Method is returning null when reads the CSV

I'm dusting off my knowledge in Java, after a long time without taking the language, and I'm using OpenCSV for Java. I wrote a method that reads a CSV file with the following structure:

id,first_name,last_name,email,gender,ip_address,date
1,Bear,Picker,bpicker0@wordpress.com,Bigender,33.63.86.239,20/06/2021
2,Emili,McEntee,emcentee1@sciencedirect.com,Bigender,163.127.107.66,03/08/2021
3,Bethena,Fortune,bfortune2@live.com,Genderqueer,52.250.33.22,22/04/2021
4,Mortie,Praten,mpraten3@google.nl,Genderfluid,181.3.231.237,09/07/2021
5,Nappy,Giabucci,ngiabucci4@unc.edu,Female,110.180.139.101,01/06/2021

This is my basic method that I wrote to read the file:

public static List<String> readDataLineByLine(String path, Class classModel) {
  try {
      Reader reader = Files.newBufferedReader(Paths.get(path));

      CsvToBean csvToBean = new CsvToBeanBuilder(reader)
              .withType(classModel)
              .withSeparator(',')
              .withSkipLines(1)
              .withIgnoreLeadingWhiteSpace(true)
              .build();

      List<String> results = csvToBean.parse();

      return results;
  } catch(IOException ex) {
      Log.error(ex.toString());
      return null;
  }
}

My model class:

public class MockarooFakeModel {

    @CsvBindByName(column = "id")
    private int ID;

    @CsvBindByName(column = "first_name")
    private String firstName;

    @CsvBindByName(column = "last_name")
    private String lastName;

    @CsvBindByName(column = "email")
    private String email;

    @CsvBindByName(column = "gender")
    private String gender;

    @CsvBindByName(column = "ip_address")
    private String IPAddress;

    @CsvBindByName(column = "date")
    private String date;

    public int getID() {
        return ID;
    }

    public void setID(int ID) {
        this.ID = ID;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getIPAddress() {
        return IPAddress;
    }

    public void setIPAddress(String IPAddress) {
        this.IPAddress = IPAddress;
    }

    public Date getDate() {
        try {
            Date date = new SimpleDateFormat("dd/MM/yyyy").parse(this.date);
            return date;
        } catch (ParseException ex) {
            Log.error(ex.toString());
            return null;
        }
    }

    public void setDate(String date) {
        this.date = date;
    }
}

For some reason, when I debug the code, it returns 4 rows instead of 5 rows, and also it returns the rows with null. I thought it was because I didn't map the model, but that didn't fix the issue. Also, I don't think that TestNG causes some conflict when I execute the test.

@Test(description = "Gets the data stored in a CSV file")
public void Test4(Method method) {
    startTest(method.getName(),"Gets the data stored in a CSV file");

    var records = Utils.readDataLineByLine("PathToTheFile.csv", MockarooFakeModel.class);
}

I'll appreciate any help to solve my issue. Thanks!

Update

I forgot to check the checkbox to answer my own question, but I left here the solution to my problem (thanks, @lastzolex).-

I deleted .withSkipLines() and updated my reader method to return a Class:

public static List<Class> readDataLineByLine(String path, Class classModel) {
    try {
        Reader reader = Files.newBufferedReader(Paths.get(path));

        CsvToBean csvToBean = new CsvToBeanBuilder(reader)
                .withType(classModel)
                .withSeparator(',')
                .withIgnoreLeadingWhiteSpace(true)
                .build();

        List<Class> results = csvToBean.parse();

        return results;
    } catch(IOException ex) {
        Log.error(ex.toString());
        return null;
    }
}

I didn't know that .withSkipLines() skipped the line of data that I was sending (and the mapping I did do that automatically).