404 errors

I am currently getting 404 errors on a single particular page. I use the Yoflash Arcade Component which can be found HERE . I have the latest Joomla Version installed as well as the latest yoflash component. The author of yoflash is currently not involved due to personal reasons, which is why I come here. If I disable the EFSEO plugin, then the 404 errors do not happen.

How can I get rid of the errors so that I can add my SEO settings?

Any and all assistance would be greatly appreciated!

Thank you,
Voice4Vision