[GELÖST] Error when activating UIKit Slider Module

Hello,

I have downloaded the template ‘ tp_surfing - Standard’ and installed it on my Joomla site, which I have just updated to 5.2.0.
I have downloaded and activated the required plugins, but now I always get the error:

"
Es ist ein Fehler aufgetreten.
0 Call to a member function test() on false
Call Stack
# Function Location
1 () JROOT/libraries/src/Form/FormField.php:1257
2 Joomla\CMS\Form\FormField->validate() JROOT/libraries/src/Form/Form.php:1126
3 Joomla\CMS\Form\Form->validate() JROOT/libraries/src/Form/Form.php:993
4 Joomla\CMS\Form\Form->process() JROOT/libraries/src/MVC/Model/FormModel.php:219
5 Joomla\CMS\MVC\Model\FormModel->validate() JROOT/administrator/components/com_modules/src/Model/ModuleModel.php:885
6 Joomla\Component\Modules\Administrator\Model\ModuleModel->validate() JROOT/libraries/src/MVC/Controller/FormController.php:636
7 Joomla\CMS\MVC\Controller\FormController->save() JROOT/administrator/components/com_modules/src/Controller/ModuleController.php:255
8 Joomla\Component\Modules\Administrator\Controller\ModuleController->save() JROOT/libraries/src/MVC/Controller/BaseController.php:730
9 Joomla\CMS\MVC\Controller\BaseController->execute() JROOT/libraries/src/Dispatcher/ComponentDispatcher.php:143
10 Joomla\CMS\Dispatcher\ComponentDispatcher->dispatch() JROOT/libraries/src/Component/ComponentHelper.php:361
11 Joomla\CMS\Component\ComponentHelper::renderComponent() JROOT/libraries/src/Application/AdministratorApplication.php:150
12 Joomla\CMS\Application\AdministratorApplication->dispatch() JROOT/libraries/src/Application/AdministratorApplication.php:195
13 Joomla\CMS\Application\AdministratorApplication->doExecute() JROOT/libraries/src/Application/CMSApplication.php:306
14 Joomla\CMS\Application\CMSApplication->execute() JROOT/administrator/includes/app.php:58
15 require_once() JROOT/administrator/index.php:32
"

All other modules seem to work, it currently only affects the UIKit modules from JP.

What version ist your php?
If you have activated both uikit plugins, this won't work.
Deactivate the plugin for j3 and j4 and only use the plugin for j4 and j5.

Tested on 8.2, 8.3....I never had the J3 Version installed.

Download Slider Modul one more time an install it.
Then test ist again.

The problem is the same.I get the same error.

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