Magento exception: Mage_Core_Exception

Magento exception.log file have this exception. What does it mean and what does it affect? How to solve this?

This is the system specification:
Magento CE 1.9.3.3
PHP 5.6.31
Windows Server 2012 R2
IIS 8.5

This is the exception log data:
2018-04-27T06:46:41+00:00 ERR (3): 
exception 'Mage_Core_Exception' with message 'Invalid block type: Mage_Newproductslider_Block_Newproductslider' in C:\Web\Webstore1_a\app\Mage.php:595
Stack trace:
#0 C:\site\app\code\core\Mage\Core\Model\Layout.php(495): Mage::throwException('Invalid block t...')
#1 C:\site\app\code\core\Mage\Core\Model\Layout.php(437): Mage_Core_Model_Layout->_getBlockInstance('newproductslide...', Array)
#2 C:\site\app\code\core\Mage\Core\Model\Email\Template\Filter.php(179): Mage_Core_Model_Layout->createBlock('newproductslide...', NULL, Array)
#3 [internal function]: Mage_Core_Model_Email_Template_Filter->blockDirective(Array)
#4 C:\site\lib\Varien\Filter\Template.php(163): call_user_func(Array, Array)
#5 C:\site\app\code\core\Mage\Core\Model\Email\Template\Filter.php(560): Varien_Filter_Template->filter('<div class="hom...')
#6 C:\site\app\code\core\Mage\Cms\Block\Page.php(123): Mage_Core_Model_Email_Template_Filter->filter('<div class="hom...')
#7 C:\site\app\code\core\Mage\Core\Block\Abstract.php(923): Mage_Cms_Block_Page->_toHtml()
#8 C:\site\app\code\core\Mage\Core\Block\Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#9 C:\site\app\code\core\Mage\Core\Block\Abstract.php(581): Mage_Core_Block_Abstract->_getChildHtml('cms_page', true)
#10 C:\site\app\code\core\Mage\Page\Block\Html\Wrapper.php(52): Mage_Core_Block_Abstract->getChildHtml('', true, true)
#11 C:\site\app\code\core\Mage\Core\Block\Abstract.php(923): Mage_Page_Block_Html_Wrapper->_toHtml()
#12 C:\site\app\code\core\Mage\Core\Block\Text\List.php(43): Mage_Core_Block_Abstract->toHtml()
#13 C:\site\app\code\core\Mage\Core\Block\Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#14 C:\site\app\code\core\Mage\Core\Block\Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#15 C:\site\app\code\core\Mage\Core\Block\Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#16 C:\site\app\design\frontend\default\tcacoustic\template\page\1column.phtml(53): Mage_Core_Block_Abstract->getChildHtml('content')
#17 C:\site\app\code\core\Mage\Core\Block\Template.php(241): include('C:\\Web\\Webstore...')
#18 C:\site\app\code\core\Mage\Core\Block\Template.php(272): Mage_Core_Block_Template->fetchView('frontend\\defaul...')
#19 C:\site\app\code\core\Mage\Core\Block\Template.php(286): Mage_Core_Block_Template->renderView()
#20 C:\site\app\code\core\Mage\Core\Block\Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#21 C:\site\app\code\core\Mage\Core\Model\Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#22 C:\site\app\code\core\Mage\Core\Controller\Varien\Action.php(390): Mage_Core_Model_Layout->getOutput()
#23 C:\site\app\code\core\Mage\Cms\Helper\Page.php(137): Mage_Core_Controller_Varien_Action->renderLayout()
#24 C:\site\app\code\core\Mage\Cms\Helper\Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'home')
#25 C:\site\app\code\core\Mage\Cms\controllers\IndexController.php(45): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'home')
#26 C:\site\app\code\core\Mage\Core\Controller\Varien\Action.php(418): Mage_Cms_IndexController->indexAction()
#27 C:\site\app\code\core\Mage\Core\Controller\Varien\Router\Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('index')
#28 C:\site\app\code\core\Mage\Core\Controller\Varien\Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#29 C:\site\app\code\core\Mage\Core\Model\App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#30 C:\site\app\Mage.php(684): Mage_Core_Model_App->run(Array)
#31 C:\site\sg\index.php(81): Mage::run('sg', 'website')
#32 {main}

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LVL 1
Boon Chye PhangAsked:
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Sam Simon NasserIT Support ProfessionalCommented:
as line 2 mentions, you have an issue in Mage_Newproductslider_Block_Newproductslider ... try disabling that plugin / add-on and test
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Sam Simon NasserIT Support ProfessionalCommented:
correct solution, assume works for user
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