The minimum quantity allowed for purchase is 4.

#0 /cache/app/code/core/Mage/Sales/Model/Quote.php(1022): Mage::throwException('The minimum qua...')
#1 /cache/app/code/core/Mage/Sales/Model/Quote.php(1046): Mage_Sales_Model_Quote->addProductAdvanced(Object(Mage_Catalog_Model_Product), NULL, 'full')
#2 /cache/app/code/local/Amasty/Promo/Block/Banner.php(125): Mage_Sales_Model_Quote->addProduct(Object(Mage_Catalog_Model_Product))
#3 /cache/app/code/local/Amasty/Promo/Block/Banner.php(41): Amasty_Promo_Block_Banner->_getQuoteBasedValidRule()
#4 /cache/app/code/local/Amasty/Promo/Block/Banner.php(170): Amasty_Promo_Block_Banner->_getValidRules()
#5 /cache/app/design/frontend/base/default/template/amasty/ampromo/banner.phtml(11): Amasty_Promo_Block_Banner->getValidRules()
#6 /cache/app/code/core/Mage/Core/Block/Template.php(241): include('/cache/app/desi...')
#7 /cache/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/base/d...')
#8 /cache/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#9 /cache/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#10 /cache/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#11 /cache/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#12 /cache/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#13 /cache/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#14 /cache/app/design/frontend/smartwave/porto_child/template/page/1column.phtml(49): Mage_Core_Block_Abstract->getChildHtml('content')
#15 /cache/app/code/core/Mage/Core/Block/Template.php(241): include('/cache/app/desi...')
#16 /cache/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/smartw...')
#17 /cache/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#18 /cache/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#19 /cache/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#20 /cache/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#21 /cache/app/code/core/Mage/Cms/Helper/Page.php(137): Mage_Core_Controller_Varien_Action->renderLayout()
#22 /cache/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'no-route-2')
#23 /cache/app/code/core/Mage/Cms/controllers/IndexController.php(75): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'no-route-2')
#24 /cache/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->noRouteAction()
#25 /cache/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('noRoute')
#26 /cache/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#27 /cache/app/code/core/Mage/Core/Model/App.php(381): Mage_Core_Controller_Varien_Front->dispatch()
#28 /cache/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#29 /cache/index.php(88): Mage::run('', 'store')
#30 {main}