codeigniter - Fatal error: Call to undefined function lang() in CI Merchant using CardSave -

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i have setup checkout using ci merchant , payment gateway provider cardsave. works using test account , test card details when trying live transaction on production account following error:

fatal error: call undefined function lang() in xxx\application\libraries\merchant\merchant_cardsave.php on line 160

line 160 looks like:

$this->post_redirect($acs_url, $data, lang('merchant_3dauth_redirect'));

i've integrated other merchants using ci merchant , haven't come across error before , haven't been able find in google either.

has come across , resolved before?


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