[Error] 
Class 'Bitrix\Sale\DiscountCouponsManager' not found (0)
/home/c/cb52567/public_html/bitrix/modules/catalog/general/discount.php:1047
#0: CAllCatalogDiscount::getSaleDiscountsByProduct(array, string, array, array, boolean)
	/home/c/cb52567/public_html/bitrix/modules/catalog/general/discount.php:1222
#1: CAllCatalogDiscount::GetDiscount(integer, integer, array, array, string, string, array)
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:2592
#2: Bitrix\Iblock\Component\Base->calculatePriceBlock(array, array, integer, boolean)
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:2380
#3: Bitrix\Iblock\Component\Base->calculateItemPrices(array)
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:3119
#4: Bitrix\Iblock\Component\Base->processProducts()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:3597
#5: Bitrix\Iblock\Component\Base->prepareData()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:3550
#6: Bitrix\Iblock\Component\Base->processResultData()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/element.php:244
#7: Bitrix\Iblock\Component\Element->processResultData()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:3955
#8: Bitrix\Iblock\Component\Base->loadData()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:3944
#9: Bitrix\Iblock\Component\Base->initialLoadAction()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/element.php:229
#10: Bitrix\Iblock\Component\Element->initialLoadAction()
	
#11: call_user_func(array)
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:4129
#12: Bitrix\Iblock\Component\Base->doAction()
	/home/c/cb52567/public_html/bitrix/modules/iblock/lib/component/base.php:4147
#13: Bitrix\Iblock\Component\Base->executeComponent()
	/home/c/cb52567/public_html/bitrix/modules/main/classes/general/component.php:648
#14: CBitrixComponent->includeComponent(string, array, boolean)
	/home/c/cb52567/public_html/bitrix/modules/main/classes/general/main.php:1039
#15: CAllMain->IncludeComponent(string, string, array, boolean)
	/home/c/cb52567/public_html/books/item.php:148
#16: include_once(string)
	/home/c/cb52567/public_html/bitrix/modules/main/include/urlrewrite.php:159
#17: include_once(string)
	/home/c/cb52567/public_html/bitrix/urlrewrite.php:2