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HELP! Error Installing Theme "Object DOMDocument"

HELP! Error Installing Theme "Object DOMDocument"

Hello to the forum users, I have a problem regarding a theme installation I had on Magento 2.
Being a bit of a layman with the platform, I wanted to ask for help from others to get a solution because I couldn't translate the error, since the administration panel works and the site keeps giving the security error, here is the problem log:

 

a:4:{i:0;s:37:"Object DOMDocument should be created.";i:1;s:11999:"#0 /home2/revlstor/public_html/vendor/magento/framework/View/Element/UiComponent/Config/Reader.php(95): Magento\Framework\View\Element\UiComponent\Config\DomMerger->getDom()
#1 /home2/revlstor/public_html/vendor/magento/module-ui/Model/Manager.php(258): Magento\Framework\View\Element\UiComponent\Config\Reader->read()
#2 /home2/revlstor/public_html/vendor/magento/module-ui/Model/Manager.php(166): Magento\Ui\Model\Manager->prepare('quickview.conta...')
#3 /home2/revlstor/public_html/vendor/magento/framework/View/Element/UiComponentFactory.php(144): Magento\Ui\Model\Manager->prepareData('quickview.conta...')
#4 /home2/revlstor/public_html/vendor/magento/framework/View/Layout/Generator/UiComponent.php(125): Magento\Framework\View\Element\UiComponentFactory->create('quickview.conta...', NULL, Array)
#5 /home2/revlstor/public_html/vendor/magento/framework/View/Layout/Generator/UiComponent.php(93): Magento\Framework\View\Layout\Generator\UiComponent->generateComponent(Object(Magento\Framework\View\Layout\Data\Structure), 'quickview.conta...', Array, Object(Magento\Framework\View\Layout\Interceptor))
#6 /home2/revlstor/public_html/vendor/magento/framework/View/Layout/GeneratorPool.php(86): Magento\Framework\View\Layout\Generator\UiComponent->process(Object(Magento\Framework\View\Layout\Reader\Context), Object(Magento\Framework\View\Layout\Generator\Context))
#7 /home2/revlstor/public_html/vendor/magento/framework/View/Layout.php(327): Magento\Framework\View\Layout\GeneratorPool->process(Object(Magento\Framework\View\Layout\Reader\Context), Object(Magento\Framework\View\Layout\Generator\Context))
#8 /home2/revlstor/public_html/var/generation/Magento/Framework/View/Layout/Interceptor.php(89): Magento\Framework\View\Layout->generateElements()
#9 /home2/revlstor/public_html/vendor/magento/framework/View/Layout/Builder.php(129): Magento\Framework\View\Layout\Interceptor->generateElements()
#10 /home2/revlstor/public_html/vendor/magento/framework/View/Page/Builder.php(55): Magento\Framework\View\Layout\Builder->generateLayoutBlocks()
#11 /home2/revlstor/public_html/vendor/magento/framework/View/Layout/Builder.php(65): Magento\Framework\View\Page\Builder->generateLayoutBlocks()
#12 /home2/revlstor/public_html/vendor/magento/framework/View/Layout.php(244): Magento\Framework\View\Layout\Builder->build()
#13 /home2/revlstor/public_html/vendor/magento/framework/View/Layout.php(859): Magento\Framework\View\Layout->build()
#14 /home2/revlstor/public_html/var/generation/Magento/Framework/View/Layout/Interceptor.php(414): Magento\Framework\View\Layout->getBlock('page_content_he...')
#15 /home2/revlstor/public_html/vendor/magento/module-cms/Helper/Page.php(171): Magento\Framework\View\Layout\Interceptor->getBlock('page_content_he...')
#16 /home2/revlstor/public_html/vendor/magento/module-cms/Controller/Index/Index.php(43): Magento\Cms\Helper\Page->prepareResultPage(Object(Magento\Cms\Controller\Index\Index\Interceptor), 'homepage_gatcom...')
#17 /home2/revlstor/public_html/var/generation/Magento/Cms/Controller/Index/Index/Interceptor.php(24): Magento\Cms\Controller\Index\Index->execute(NULL)
#18 /home2/revlstor/public_html/vendor/magento/framework/App/Action/Action.php(102): Magento\Cms\Controller\Index\Index\Interceptor->execute()
#19 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Framework\App\Action\Action->dispatch(Object(Magento\Framework\App\Request\Http))
#20 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Cms\Controller\Index\Index\Interceptor->___callParent('dispatch', Array)
#21 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Cms\\Con...', 'dispatch', Object(Magento\Cms\Controller\Index\Index\Interceptor), Array, 'customer-app-ac...')
#22 /home2/revlstor/public_html/vendor/magento/module-customer/Model/App/Action/ContextPlugin.php(61): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#23 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Customer\Model\App\Action\ContextPlugin->aroundDispatch(Object(Magento\Cms\Controller\Index\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#24 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Cms\\Con...', 'dispatch', Object(Magento\Cms\Controller\Index\Index\Interceptor), Array, 'contextPlugin')
#25 /home2/revlstor/public_html/vendor/magento/module-store/App/Action/Plugin/Context.php(106): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#26 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Store\App\Action\Plugin\Context->aroundDispatch(Object(Magento\Cms\Controller\Index\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#27 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Cms\\Con...', 'dispatch', Object(Magento\Cms\Controller\Index\Index\Interceptor), Array, 'storeCheck')
#28 /home2/revlstor/public_html/vendor/magento/module-store/App/Action/Plugin/StoreCheck.php(44): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#29 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Store\App\Action\Plugin\StoreCheck->aroundDispatch(Object(Magento\Cms\Controller\Index\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#30 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Cms\\Con...', 'dispatch', Object(Magento\Cms\Controller\Index\Index\Interceptor), Array, 'tax-app-action-...')
#31 /home2/revlstor/public_html/vendor/magento/module-tax/Model/App/Action/ContextPlugin.php(91): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#32 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Tax\Model\App\Action\ContextPlugin->aroundDispatch(Object(Magento\Cms\Controller\Index\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#33 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Cms\\Con...', 'dispatch', Object(Magento\Cms\Controller\Index\Index\Interceptor), Array, 'weee-app-action...')
#34 /home2/revlstor/public_html/vendor/magento/module-weee/Model/App/Action/ContextPlugin.php(112): Magento\Cms\Controller\Index\Index\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#35 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(142): Magento\Weee\Model\App\Action\ContextPlugin->aroundDispatch(Object(Magento\Cms\Controller\Index\Index\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#36 /home2/revlstor/public_html/var/generation/Magento/Cms/Controller/Index/Index/Interceptor.php(39): Magento\Cms\Controller\Index\Index\Interceptor->___callPlugins('dispatch', Array, Array)
#37 /home2/revlstor/public_html/vendor/magento/framework/App/FrontController.php(55): Magento\Cms\Controller\Index\Index\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#38 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(74): Magento\Framework\App\FrontController->dispatch(Object(Magento\Framework\App\Request\Http))
#39 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(70): Magento\Framework\App\FrontController\Interceptor->___callParent('dispatch', Array)
#40 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'requestPreproce...')
#41 /home2/revlstor/public_html/vendor/magento/module-store/App/FrontController/Plugin/RequestPreprocessor.php(94): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#42 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Store\App\FrontController\Plugin\RequestPreprocessor->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#43 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'install')
#44 /home2/revlstor/public_html/vendor/magento/framework/Module/Plugin/DbStatusValidator.php(69): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#45 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\Framework\Module\Plugin\DbStatusValidator->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#46 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(63): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'front-controlle...')
#47 /home2/revlstor/public_html/vendor/magento/module-page-cache/Model/App/FrontController/BuiltinPlugin.php(73): Magento\Framework\Interception\Chain\Chain->Magento\Framework\Interception\Chain\{closure}(Object(Magento\Framework\App\Request\Http))
#48 /home2/revlstor/public_html/vendor/magento/framework/Interception/Chain/Chain.php(67): Magento\PageCache\Model\App\FrontController\BuiltinPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#49 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(138): Magento\Framework\Interception\Chain\Chain->invokeNext('Magento\\Framewo...', 'dispatch', Object(Magento\Framework\App\FrontController\Interceptor), Array, 'front-controlle...')
#50 /home2/revlstor/public_html/vendor/magento/module-page-cache/Model/App/FrontController/VarnishPlugin.php(55): Magento\Framework\App\FrontController\Interceptor->Magento\Framework\Interception\{closure}(Object(Magento\Framework\App\Request\Http))
#51 /home2/revlstor/public_html/vendor/magento/framework/Interception/Interceptor.php(142): Magento\PageCache\Model\App\FrontController\VarnishPlugin->aroundDispatch(Object(Magento\Framework\App\FrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#52 /home2/revlstor/public_html/var/generation/Magento/Framework/App/FrontController/Interceptor.php(26): Magento\Framework\App\FrontController\Interceptor->___callPlugins('dispatch', Array, Array)
#53 /home2/revlstor/public_html/vendor/magento/framework/App/Http.php(135): Magento\Framework\App\FrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#54 /home2/revlstor/public_html/vendor/magento/framework/App/Bootstrap.php(258): Magento\Framework\App\Http->launch()
#55 /home2/revlstor/public_html/index.php(39): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#56 {main}";s:3:"url";s:1:"/";s:11:"script_name";s:10:"/index.php";}