Codeigniter file uploading error in server - php

Question

I am getting this error:
Could not open /home/Projectname/public_html/assets/uploads/empfiles/
The filetype you are attempting to upload is not allowed.
for reading! File does not exist.
Please help me to resolve this.
I am using Codeigniter version:2.1.4
I have tried this solutions also, but no changes I found.
Uploading in Codeigniter - The filetype you are attempting to upload is not allowed
Code goes here:
$filextesions = $fileparameters->file_extensions;
$path = $fileparameters->path_required;
$filename = $fileparameters->filename;
$inputfilename = $fileparameters->inputname;
$fileType = $fileparameters->$inputfilename['type'];
if($fileparameters->width=='')
{
$width = 0;
}
else
{
$width = $fileparameters->width;
}
if($fileparameters->height=='')
{
$height = 0;
}
else
{
$height = $fileparameters->height;
}
/** Checking for file existence **/
$file_exist= FCPATH.'assets/uploads/'.$path.'/'.$filename;
if(file_exists($file_exist))
{
/* Renaming the existed file name */
$newfilename = uniqid().$filename;
}else
{
$newfilename = $filename;
}
/** Conifgure File parameters **/
$config['upload_path'] = FCPATH.'assets/uploads/'.$path;
$config['allowed_types'] = $filextesions;
$config['file_name'] = $newfilename;
$config['remove_spaces'] = FALSE ;
$config['max_size'] = '0';
$config['max_width'] = $width;
$config['max_height'] = $height;
/** Intialising uploadbject **/
$this->upload->initialize($config);
/** Checking for File existence **/
if($this->upload->do_upload($inputfilename))
{
return $newfilename;
}
else
{
return $this->upload->display_errors();
}
Mime types for xlsx files
'xlsx' => array('application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', 'application/zip', 'application/vnd.ms-excel')
Advance thanks