Issue: An exception occurred: [Error] Using $this when not in object context in src\addons\vw\vw\XFRM\Entity\Category.php on line 64

An exception occurred: [Error] Using $this when not in object context in src\addons\vw\vw\XFRM\Entity\Category.php on line 64

vw\vw\XFRM\Entity\Category::getStructure() in src/XF/Mvc/Entity/Manager.php at line 70
XF\Mvc\Entity\Manager->getEntityStructure() in src/XF/Mvc/Entity/Finder.php at line 759
XF\Mvc\Entity\Finder->join() in src/XF/Mvc/Entity/Finder.php at line 649
XF\Mvc\Entity\Finder->with() in src/addons/XFRM/Widget/NewResources.php at line 44
XFRM\Widget\NewResources->render() in internal_data/code_cache/widgets/_16_xfrm_forum_overview_new_resources.php at line 5
XF\SubContainer\Widget->{closure}() in src/XF/Template/Templater.php at line 6681
XF\Template\Templater->renderWidgetClosure() in src/XF/SubContainer/Widget.php at line 168
XF\SubContainer\Widget->getCompiledWidget() in src/XF/Template/Templater.php at line 1634
XF\Template\Templater->widgetPosition() in src/addons/vw/vw/XF/Template/Templater.php at line 965
vw\vw\XF\Template\Templater->widgetPosition() in internal_data/code_cache/templates/l4/s19/public/forum_list.php at line 217
XF\Template\Templater->{closure}() in src/XF/Template/Templater.php at line 1315
XF\Template\Templater->renderTemplate() in src/addons/vw/vw/XF/Template/Templater.php at line 854
vw\vw\XF\Template\Templater->renderTemplate() in src/XF/Template/Template.php at line 24
XF\Template\Template->render() in src/XF/Mvc/Renderer/Html.php at line 48
XF\Mvc\Renderer\Html->renderView() in src/XF/Mvc/Dispatcher.php at line 458
XF\Mvc\Dispatcher->renderView() in src/XF/Mvc/Dispatcher.php at line 440
XF\Mvc\Dispatcher->renderReply() in src/XF/Mvc/Dispatcher.php at line 400
XF\Mvc\Dispatcher->render() in src/XF/Mvc/Dispatcher.php at line 58
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2184
XF\App->run() in src/XF.php at line 391
XF::runApp() in index.php at line 20