Widget Error

Getting this error, not sure what it means and how to fix. Running 2.3

Code:

Server error log
InvalidArgumentException: Template public:extra_footer error: No widget defined with a widget_key of online_list_online_statistics src/XF/SubContainer/Widget.php:85
Generated by: Unknown account Sep 28, 2024 at 5:15 PM
Stack trace
#0 src/XF/Container.php(233): XF\SubContainer\Widget->XF\SubContainer\{closure}('online_list_onl...', Array, Object(XF\Container))
#1 src/XF/SubContainer/Widget.php(150)...

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