Class ‘Mage_Bbsnetaxept_Helper_Data’ not found in app/Mage.php on line 547

Problem description Magento WSOD or blank page is shown on attempt to save Shipping method with Trollweb/Bring extension. Saving shipping method or carrier in Magento fails with the following error: PHP Fatal error: Class ‘Mage_Bbsnetaxept_Helper_Data’ not found in app/Mage.php on line 547, referer: https://somestore.example.com/index.php/admin/system_config/edit/section/carriers/key/4d7adc02a29dd8084561ac40baca1318 Cause The reason of the error is typo in Trollweb/Bring extension and it happens only if some error is returned from Bring gateway on saving Shipping method or carrier. Actual error… Read the rest