404 error for missing bx_loader.gif

I have a 404 error log which is telling me it couldn’t find this image on the day I put the website into maintenance mode:

/wp-content​/plugins​/easy-pie-maintenance-mode​/styles​/images​/bx_loader.gif

Perhaps it is something you want to check out? Thanks for the great plugin!

https://ww.wp.xz.cn/plugins/easy-pie-maintenance-mode/