How can i solve the server issue ?

[CIX]

An exception occurred: [TypeError] Argument 2 passed to XF\Mvc\Entity\Manager::findByIds() must be of the type array, string given in src/XF/Mvc/Entity/Manager.php on line 198

1. XF\Mvc\Entity\Manager->findByIds()
2. call_user_func_array() in src/XF/Template/Templater.php at line 920
3. XF\Template\Templater->method() in internal_data/code_cache/templates/l1/s0/admin/option_template_registrationWelcome.php at line 10
4. XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 1230
5. XF\Template\Templater->renderTemplate() in src/XF/Template/Templater.php at line 1304
6. XF\Template\Templater->includeTemplate() in internal_data/code_cache/templates/l1/s0/admin/option_macros.php at line 217
7. XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 643
8. XF\Template\Templater->callMacro() in internal_data/code_cache/templates/l1/s0/admin/option_macros.php at line 478
9. XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 643
10. XF\Template\Templater->callMacro() in internal_data/code_cache/templates/l1/s0/admin/option_list.php at line 64
11. XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 1230
12. XF\Template\Templater->renderTemplate() in src/XF/Template/Template.php at line 24
13. XF\Template\Template->render() in src/XF/Mvc/Renderer/Html.php at line 48
14. XF\Mvc\Renderer\Html->renderView() in src/XF/Mvc/Dispatcher.php at line 332
15. XF\Mvc\Dispatcher->renderView() in src/XF/Mvc/Dispatcher.php at line 303
16. XF\Mvc\Dispatcher->render() in src/XF/Mvc/Dispatcher.php at line 44
17. XF\Mvc\Dispatcher->run() in src/XF/App.php at line 1880
18. XF\App->run() in src/XF.php at line 328
19. XF::runApp() in admin.php at line 13

When i click on the user registeration, it gives me an error..
How can i fix the issue in my website..