i can't save uploaded image of my plugin in osclass

$avatar = Params::getParam('pAvatar');
      
if(Params::getParam('pAvatar') <> '') {
  $user = User::newInstance()->findByPrimaryKey($userId);
 
  if($user['s_profile_img'] <> '') {
    @unlink(osc_content_path() . 'uploads/user-images/' . $user['s_profile_img']);
  }
      
  osc_base64_to_image(Params::getParam('pAvatar'));
 }