Template onepage and PHP8 migration

ParseError:
Unclosed '{' on line 72

at /var/www/vhosts/coopluppolo.it/httpdocs/templates/shaper_onepage/error.php:103
at Joomla\CMS\Document\HtmlDocument->_loadTemplate()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Document/HtmlDocument.php:796)
at Joomla\CMS\Document\HtmlDocument->_fetchTemplate()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Document/HtmlDocument.php:613)
at Joomla\CMS\Document\HtmlDocument->parse()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Document/HtmlDocument.php:631)
at Joomla\CMS\Document\HtmlDocument->render()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Document/ErrorDocument.php:139)
at Joomla\CMS\Document\ErrorDocument->render()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Error/Renderer/HtmlRenderer.php:78)
at Joomla\CMS\Error\Renderer\HtmlRenderer->render()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Exception/ExceptionHandler.php:121)
at Joomla\CMS\Exception\ExceptionHandler::render()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Exception/ExceptionHandler.php:72)
at Joomla\CMS\Exception\ExceptionHandler::handleException()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Application/CMSApplication.php:322)
at Joomla\CMS\Application\CMSApplication->execute()
(/var/www/vhosts/coopluppolo.it/httpdocs/includes/app.php:61)
at require_once('/var/www/vhosts/coopluppolo.it/httpdocs/includes/app.php')
(/var/www/vhosts/coopluppolo.it/httpdocs/index.php:32)

TypeError:
set_time_limit(): Argument #1 ($seconds) must be of type int, string given

at /var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Filesystem/Folder.php:546
at set_time_limit()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Filesystem/Folder.php:546)
at Joomla\CMS\Filesystem\Folder::_items()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Filesystem/Folder.php:521)
at Joomla\CMS\Filesystem\Folder::folders()
(/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/parser/addon-parser.php:198)
at AddonParser::getAddons()
(/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/parser/addon-parser.php:1224)
at require_once('/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/parser/addon-parser.php')
(/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/builder/classes/addon.php:28)
at require_once('/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/builder/classes/addon.php')
(/var/www/vhosts/coopluppolo.it/httpdocs/components/com_sppagebuilder/helpers/autoload.php:42)
at BuilderAutoload::loadClasses()
(/var/www/vhosts/coopluppolo.it/httpdocs/plugins/system/sppagebuilder/sppagebuilder.php:28)
at require_once('/var/www/vhosts/coopluppolo.it/httpdocs/plugins/system/sppagebuilder/sppagebuilder.php')
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Extension/ExtensionManagerTrait.php:217)
at Joomla\CMS\Application\CMSApplication->loadPluginFromFilesystem()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Extension/ExtensionManagerTrait.php:160)
at Joomla\CMS\Application\CMSApplication->loadExtension()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Extension/ExtensionManagerTrait.php:99)
at Joomla\CMS\Application\CMSApplication->bootPlugin()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Plugin/PluginHelper.php:232)
at Joomla\CMS\Plugin\PluginHelper::import()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Plugin/PluginHelper.php:192)
at Joomla\CMS\Plugin\PluginHelper::importPlugin()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Application/CMSApplication.php:744)
at Joomla\CMS\Application\CMSApplication->initialiseApp()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Application/SiteApplication.php:635)
at Joomla\CMS\Application\SiteApplication->initialiseApp()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Application/SiteApplication.php:226)
at Joomla\CMS\Application\SiteApplication->doExecute()
(/var/www/vhosts/coopluppolo.it/httpdocs/libraries/src/Application/CMSApplication.php:293)
at Joomla\CMS\Application\CMSApplication->execute()
(/var/www/vhosts/coopluppolo.it/httpdocs/includes/app.php:61)
at require_once('/var/www/vhosts/coopluppolo.it/httpdocs/includes/app.php')
(/var/www/vhosts/coopluppolo.it/httpdocs/index.php:32)

Hi Guido
You may try this

Change default template for other one than Onepage it could be casiopea or any joomla default, then go to:

Extensions> Extension manager> Manage> Tick Onepage template (to be deleted)> Click "Uninstall".

Ensure that the template to be un-installed is not a default.

Then install the new version of Onepage

As for the /com_sppagebuilder/parser/addon-parser.php') errors

I solve it by going back to SPP v3.8.10
In extensions disable all SP Pagebuilder items
Then renaming the com_sppagebuilder folder to com_sppagebuilder-v5-8
And then install the SSP 3.8.10

I know its not the best but i guess you are in a hurry