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I am getting this error couponcodes plugin

inc/plugins/couponcodes.php 568 DefaultForm->generate_yes_no_radio

and the in 568 line is

			$form_container->output_row($lang->couponcodes_used_only, $lang->couponcodes_used_only_desc, $form->generate_yes_no_radio('usedonly', 0, true, "", ""), 'usedonly');

please tell me how to fix it .

aby help ?

Your error is not visible.
Anyway, the 2 last arguments of generate_yes_no_radio must be arrays or nothing, not strings:

$form_container->output_row($lang->couponcodes_used_only, $lang->couponcodes_used_only_desc, $form->generate_yes_no_radio('usedonly', 0, true, [], []), 'usedonly');

or:

$form_container->output_row($lang->couponcodes_used_only, $lang->couponcodes_used_only_desc, $form->generate_yes_no_radio('usedonly', 0, true), 'usedonly');

Thank you @crazycat , Error solved