Hello.
I have disable everything except the module os_contentslider
and I see in the console only errors from the template : https://prnt.sc/26p47my
Can you please let me know how are you see the error comes from the os_contentslider ?
I have install the module OS Content Slider in a clean Joomla 4 installation , I dont see any problem with it , and also I see and the title which in your template is not show , you can check at the link mysite/DEFAULT4/ (I have provide my site in the fields of the ticket)
Or just change the template to Joomla default and you see the module has no problems at all .
So it must be something with your theme .
Thanks