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(1/1) ContextErrorException

Warning: Cannot modify header information - headers already sent by (output started at /var/www/html/modules/onepay/onepay.php:1)

in FrontController.php line 11
at FrontController->initHeader()in Controller.php line 251
at ControllerCore->run()in Dispatcher.php line 428
at DispatcherCore->dispatch()in index.php line 28