i got this Warning from functions.php

<br /> <b>Warning</b>: Undefined variable $error_num in <b> oc-content/plugins/sms/functions.php</b> on line <b>417</b><br />

its caused by this line :

  if($error_num > 0) {
    $output['status'] = 'ERROR';
    $output['message'] = $error;
  }

which i suggest to be replaced with this one

  if(isset($error_num)) {
    $output['status'] = 'ERROR';
    $output['message'] = $error;
  }

please correct me if i missed something.

There will be fix in next update.
Easy way to fix is to add $error_num = 0; at start