when i change the popup background, popup is going to hidden. And appear transparent. Its trouble

i think the problem upload process. i did an image with photoshop and save to jpg 692*320 px. And  enter the popup newsletter module and upload it. Then the result is same. image hidden. install the prestashop 1.7.2.4 and install the vela VMEGA  and  like that...this process in wamp server in local. Php v 7.0.23. 

open the debug mode homepage error...

Table 'mega.ps_smart_blog_post' doesn't exist

SELECT * FROM ps_smart_blog_post p INNER JOIN                 ps_smart_blog_post_lang pl ON p.id_smart_blog_post=pl.id_smart_blog_post INNER JOIN                 ps_smart_blog_post_shop ps ON pl.id_smart_blog_post = ps.id_smart_blog_post AND ps.id_shop = 1                WHERE pl.id_lang=1 		                AND p.active= 1 ORDER BY p.id_smart_blog_post DESC                 LIMIT 6

at line 744 in file classes/db/Db.php

739.         if ($webservice_call && $errno) {
740.             $dbg = debug_backtrace();
741.             WebserviceRequest::getInstance()->setError(500, '[SQL Error] '.$this->getMsgError().'. From '.(isset($dbg[3]['class']) ? $dbg[3]['class'] : '').'->'.$dbg[3]['function'].'() Query was : '.$sql, 97);
742.         } elseif (_PS_DEBUG_SQL_ && $errno && !defined('PS_INSTALLATION_IN_PROGRESS')) {
743.             if ($sql) {
744.                 throw new PrestaShopDatabaseException($this->getMsgError().'<br /><br /><pre>'.$sql.'</pre>');
745.             }
746. 747.             throw new PrestaShopDatabaseException($this->getMsgError());
748.         }
749.     }

• DbCore->displayError - [line 378 - classes/db/Db.php] - [1 Arguments]
• DbCore->query - [line 596 - classes/db/Db.php] - [1 Arguments]
• DbCore->executeS - [line 672 - modules/smartblog/classes/SmartBlogPost.php] - [1 Arguments]
• SmartBlogPost::GetPostLatestHome - [line 66 - modules/smartbloghomelatestnews/smartbloghomelatestnews.php] - [1 Arguments]
• smartbloghomelatestnews->hookSmartBlogHomePost - [line 50 - modules/smartbloghomelatestnews/smartbloghomelatestnews.php] - [1 Arguments]
• smartbloghomelatestnews->hookDisplayHeader - [line 895 - classes/Hook.php] - [1 Arguments]
• HookCore::coreCallHook - [line 327 - classes/Hook.php] - [3 Arguments]
• HookCore::callHookOn - [line 843 - classes/Hook.php] - [3 Arguments]
• HookCore::exec - [line 544 - classes/controller/FrontController.php] - [1 Arguments]
• FrontControllerCore->initContent - [line 37 - controllers/front/IndexController.php]
• IndexControllerCore->initContent - [line 205 - classes/controller/Controller.php]
• ControllerCore->run - [line 379 - classes/Dispatcher.php]
• DispatcherCore->dispatch - [line 28 - index.php]