Joomla 4.0 error

I get an error in the install phase. file added

when started error message is JSubmenuHelper not found.

this has been changed in JHtmlSidebar in joomla 4 Beta 2

regards Just Lewis

0 Call to undefined method Joomla\Database\Mysqli\MysqliDriver::getErrorNum()

Call stack
# Function Location
1 () JROOT\administrator\components\com_joodb\views\listdata\view.html.php:78
2 JoodbViewListdata->display() JROOT\administrator\components\com_joodb\controller.php:56
3 JooDBController->listdata() JROOT\libraries\src\MVC\Controller\BaseController.php:729
4 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT\administrator\components\com_joodb\joodb.php:37
5 require_once() JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:69
6 Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}() JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:71
7 Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch() JROOT\libraries\src\Component\ComponentHelper.php:389
8 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT\libraries\src\Application\AdministratorApplication.php:142
9 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT\libraries\src\Application\AdministratorApplication.php:185
10 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT\libraries\src\Application\CMSApplication.php:266
11 Joomla\CMS\Application\CMSApplication->execute() JROOT\administrator\includes\app.php:63
12 require_once() JROOT\administrator\index.php:36