Joomla! Template LT Art Studio - Item Support

Hello,

I have updated Joomla from 3.6.5 to the newest version 3.8.3. Update caused an error and now I can not login to the admin panel.

I thought. that it could be a problem with Helix Framework and found this topic:
https://www.joomshaper.com/forums/problem-with-helix-framework-since-updating-to-joomla-3-7
where someone from Helix support recommends updating the framawork to the latest version. Maybe this will solve the problem.

Could you please help me fix this bug?

Description of the error:

Fatal error: Call to undefined method JAdminCssMenu::addChild() in administrator/modules/mod_sppagebuilder_admin_menu/tmpl/default_enabled.php on line 16, referer: administrator/
PHP Stack trace:, referer: administrator/
PHP 1. {main}() administrator/index.php:0, referer: administrator/
PHP 2. Joomla\\CMS\\Application\\CMSApplication->execute() administrator/index.php:51, referer: administrator/
PHP 3. Joomla\\CMS\\Application\\AdministratorApplication->render() libraries/src/Application/CMSApplication.php:273, referer: administrator/
PHP 4. Joomla\\CMS\\Application\\CMSApplication->render() libraries/src/Application/AdministratorApplication.php:436, referer: administrator/
PHP 5. Joomla\\CMS\\Document\\HtmlDocument->render() libraries/src/Application/CMSApplication.php:1117, referer: administrator/
PHP 6. Joomla\\CMS\\Document\\HtmlDocument->_renderTemplate() libraries/src/Document/HtmlDocument.php:557, referer: administrator/
PHP 7. Joomla\\CMS\\Document\\HtmlDocument->getBuffer() libraries/src/Document/HtmlDocument.php:782, referer: administrator/
PHP 8. Joomla\\CMS\\Document\\Renderer\\Html\\ModulesRenderer->render() libraries/src/Document/HtmlDocument.php:491, referer: administrator/
PHP 9. Joomla\\CMS\\Document\\Renderer\\Html\\ModuleRenderer->render() libraries/src/Document/Renderer/Html/ModulesRenderer.php:47, referer: administrator/
PHP 10. Joomla\\CMS\\Helper\\ModuleHelper::renderModule() ibraries/src/Document/Renderer/Html/ModuleRenderer.php:98, referer: administrator/
PHP 11. include() libraries/src/Helper/ModuleHelper.php:201, referer: administrator/
PHP 12. require() administrator/modules/mod_sppagebuilder_admin_menu/mod_sppagebuilder_admin_menu.php:22, referer: administrator/
PHP 13. require() administrator/modules/mod_sppagebuilder_admin_menu/tmpl/default.php:13, referer: administrator/

Hello

Thank you for quick response.

The problem has been fix.