500 Errors just started happening

[rmturner]

I'm using Prestashop 1.7.4.3 and PHP version is 7.1    I haven't done anything to the site in the backend but 500 errors just started in.  I'm pasting the results of debugging because I couldn't upload a 200kb screenshot.  The site is collectibleartwear.com

(1/1) ContextErrorException

Warning: Declaration of BWDisplay::setTemplate($template) should be compatible with FrontControllerCore::setTemplate($template, $params = Array, $locale = NULL)

in Display.php line 49

at ErrorHandler->handleError(2, 'Declaration of BWDisplay::setTemplate($template) should be compatible with FrontControllerCore::setTemplate($template, $params = Array, $locale = NULL)', '/home/collect/public_html/modules/lgtagmanager/backward_compatibility/Display.php', 49, array())in backward.php line 39

at require_once()in backward.php line 39

at require('/home/collect/public_html/modules/lgtagmanager/backward_compatibility/backward.php')in lgtagmanager.php line 41

at LGTagManager->__construct()

at ReflectionClass->newInstance()in Container.php line 127

at Container->makeInstanceFromClassName('lgtagmanager', array('lgtagmanager' => true))in Container.php line 160

at Container->doMake('lgtagmanager', array('lgtagmanager' => true))in Container.php line 173

at Container->make('lgtagmanager')in ServiceLocator.php line 60

at ServiceLocator::get('lgtagmanager')in Module.php line 1091

at ModuleCore::coreLoadModule('lgtagmanager')in Module.php line 1071

at ModuleCore::getInstanceByName('lgtagmanager')in Hook.php line 837

at HookCore::exec('displayHeader')in FrontController.php line 552

at FrontControllerCore->initContent()in IndexController.php line 37

at IndexControllerCore->initContent()in Controller.php line 255

at ControllerCore->run()in Dispatcher.php line 428

at DispatcherCore->dispatch()in index.php line 28

 

 

Edited September 28, 2021 by rmturner
putting in link to damaged site (see edit history)

[rmturner]

I finally fixed it by disabling friendly URLs and re-enabling them in Shop Parameters/Product Settings and Traffic and SEO Settings, which recreates .htaccess. 

This has been happening once a month on another site I have using PS 1.7.5.  Yeah, it works, but I would really like to know how to fix it.  Thanks.