Uncaught TypeError: win.send_to_editor is not a function

Im getting error:
Uncaught TypeError: win.send_to_editor is not a function
while trying to add thumbnail to post in custom post type from Toolset plugin, how should i deal with that?

Fixed. Problem was caused by smart custom css plugin.

Hi,

Great! I’m glad it’s resolved! If you need help with anything else, please open a new topic.

Have a nice day!

Best Regards,
Csaba