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Hi, in SP Page Builder 3, when I adding the Opt-in addon to my page, the menu for creating articles in the frontend generated error 500. The menu for creating events in the EventBooking component also went on to give error 500. When I disable the Opt- in addon, the menus work without problem.

Joomla 3.9.1
PHP 7.0
SP Page Builder 3.3.6
Error: Fatal error: Call to undefined method JEventDispatcher::getContent() in ...

Log:
Fatal error: Call to undefined method JEventDispatcher::getContent() in /home/http://meudominio.com.br/public/plugins/editors-xtd/readmore/readmore.php on line 44 Call Stack: 0.0005 260232
1. {main}() /home/http://meudominio.com.br/public/index.php:0 0.2613 8171296
2. Joomla\CMS\Application\CMSApplication->execute() /home/http://meudominio.com.br/public/index.php:49 2.6741 29347792
3. Joomla\CMS\Application\SiteApplication->render() /home/http://meudominio.com.br/public/libraries/src/Application/CMSApplication.php:201 2.6744 29348568
4. Joomla\CMS\Application\CMSApplication->render() /home/http://meudominio.com.br/public/libraries/src/Application/SiteApplication.php:780 2.9386 32079240
5. Joomla\CMS\Document\HtmlDocument->render() /home/http://meudominio.com.br/public/libraries/src/Application/CMSApplication.php:1041 2.9386 32079312
6. Joomla\CMS\Document\HtmlDocument->_renderTemplate() /home/http://meudominio.com.br/public/libraries/src/Document/HtmlDocument.php:557 3.0844 34925776
7. Joomla\CMS\Document\HtmlDocument->getBuffer() /home/http://meudominio.com.br/public/libraries/src/Document/HtmlDocument.php:783 3.0845 34926000
8. Joomla\CMS\Document\Renderer\Html\ModulesRenderer->render() /home/http://meudominio.com.br/public/libraries/src/Document/HtmlDocument.php:491 3.0846 34926656
9. Joomla\CMS\Document\Renderer\Html\ModuleRenderer->render() /home/http://meudominio.com.br/public/libraries/src/Document/Renderer/Html/ModulesRenderer.php:47 3.0849 34933528
10. Joomla\CMS\Helper\ModuleHelper::renderModule() /home/http://meudominio.com.br/public/libraries/src/Document/Renderer/Html/ModuleRenderer.php:98 3.0892 34976776
11. include('/home/http://meudominio.com.br/public/modules/mod_sppagebuilder/mod_sppagebuilder.php') /home/http://meudominio.com.br/public/libraries/src/Helper/ModuleHelper.php:201 3.0901 34991456
12. require('/home/http://meudominio.com.br/public/modules/mod_sppagebuilder/tmpl/default.php') /home/http://meudominio.com.br/public/modules/mod_sppagebuilder/mod_sppagebuilder.php:12 3.1694 39414440
13. AddonParser::viewAddons() /home/http://meudominio.com.br/public/modules/mod_sppagebuilder/tmpl/default.php:22 3.4671 42464584
14. AddonParser::getAddonHtmlView() /home/http://meudominio.com.br/public/components/com_sppagebuilder/parser/addon-parser.php:266 3.4698 42484088
15. SppagebuilderAddonOptin_form->render() /home/http://meudominio.com.br/public/components/com_sppagebuilder/parser/addon-parser.php:424 3.4779 42589144
16. JEventDispatcher->trigger() /home/http://meudominio.com.br/public/components/com_sppagebuilder/addons/optin_form/site.php:195 3.4819 42604976
17. JEvent->update() /home/http://meudominio.com.br/public/libraries/joomla/event/dispatcher.php:160 3.4819 42605800
18. call_user_func_array:{/home/http://meudominio.com.br/public/libraries/joomla/event/event.php:70}()() /home/http://meudominio.com.br/public/libraries/joomla/event/event.php:70 3.4819 42605840
19. PlgButtonReadmore->onDisplay() /home/http://meudominio.com.br/public/libraries/joomla/event/event.php:70


Any tips on root cause?
Thanks.