Missing Argument 1 in function

[eluser]Unknown[/eluser]

A PHP Error was encountered

Severity: Warning

Message: Missing argument 1 for Etr::delete_etr()

Filename: controllers/etr.php

Line Number: 165

I'm getting this error when I try to delete a saved data. Here's my code in 165:

Code:

public function delete_etr($p_id){
  $this->load->model('Timesheet','ts');
  $etr_data['ID'] = $p_id;
  $this->ts->delete($etr_data);
  $this->main();
}

Is this a bug? Please help me. Thanks!