php - Suitescript -- Unexpected error on using getSelectOptions -

i'm trying retrieve available options shipping method sales order form encountered unexpected error in using getselectoptions.

function get_select_options(datain) {     var rec = nlapicreaterecord(datain.recordtype);         var field = rec.getfield(datain.field);     var options = field.getselectoptions();      return options; } 

and here's code calling script.

$url = "https://rest.sandbox.netsuite.com/app/site/hosting/restlet.nl"; $client = new client();  $authorization = [     'nlauth nlauth_account='.getenv('netsuite_account'),     'nlauth_email='.getenv('netsuite_email'),     'nlauth_signature='.getenv('netsuite_password'),     'nlauth_role='.getenv('netsuite_role') ];  $response = $client->request('get', $url,      'headers' => [         'authorization' => implode(',', $authorization),         'content-type' => 'application/json'     ],     'query' => [         'script' => '343',         'deploy' => '1',         'recordtype' => 'salesorder',         'field' => 'shipmethod'     ] ]);  return json_decode($response->getbody()); 

my record type , field seems correct have read in docs. followed of example codes uses getselectoptions, can't move on because of unexpected/unknown error. tried return record (rec) make sure php code working.

guzzlehttp\exception\serverexception message  'server error: `get https://rest.sandbox.netsuite.com/app/site/hosting/restlet.nl?script=343&deploy=1&recordtype=salesorder&field=shipmethod`  resulted in `500 internal server error` response:  {"error" : {"code" : "unexpected_error", "message" : "an unexpected error has occurred. error id: irc3j6d915k2asvrqbfhb" (truncated...) '