Bug in beta version: Alexandria Book Library for Joomla! 5

[Slacker]

I have installed the betaversion on Joomla 5.1 and 5.2 but I get error when accessing it in menu.
404 cant find category

Call Stack
#    Function    Location
1    ()    JROOT\components\com_abook\views\category\view.html.php:56
2    AbookViewCategory->display()    JROOT\libraries\src\Cache\Controller\ViewController.php:95
3    Joomla\CMS\Cache\Controller\ViewController->get()    JROOT\libraries\src\MVC\Controller\BaseController.php:692
4    Joomla\CMS\MVC\Controller\BaseController->display()    JROOT\components\com_abook\controller.php:36
5    AbookController->display()    JROOT\libraries\src\MVC\Controller\BaseController.php:730
6    Joomla\CMS\MVC\Controller\BaseController->execute()    JROOT\components\com_abook\abook.php:27
7    require_once()    JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:71
8    Joomla\CMS\Dispatcher\LegacyComponentDispatcher::Joomla\CMS\Dispatcher\{closure}()    JROOT\libraries\src\Dispatcher\LegacyComponentDispatcher.php:73
9    Joomla\CMS\Dispatcher\LegacyComponentDispatcher->dispatch()    JROOT\libraries\src\Component\ComponentHelper.php:361
10    Joomla\CMS\Component\ComponentHelper::renderComponent()    JROOT\libraries\src\Application\SiteApplication.php:218
11    Joomla\CMS\Application\SiteApplication->dispatch()    JROOT\libraries\src\Application\SiteApplication.php:261
12    Joomla\CMS\Application\SiteApplication->doExecute()    JROOT\libraries\src\Application\CMSApplication.php:306
13    Joomla\CMS\Application\CMSApplication->execute()    JROOT\includes\app.php:58
14    require_once()