Placing legends on views not working

Hello, I check this site for placing legends on views, and I cannot understand why this isnt working. Based on other posts this should work based on list structure and stuff but I am getting this error message and I cant figure out why. Has anyone seen this before? do I have to duplicate the legend views before placing them?

I also tried to single out one view legend, but I cant get it to be placed on the sheet either: