Why isn't it letting me put this hole?

I'm not sure what I'm missing. It looks like I've done everything, the feature is displaying, and I'm not seeing any errors/warnings, but ok is greyed out. It's a shelled hemisphere on top of a cylinder, and the whole is going onto the hemisphere. I've projected a sketch onto the hemisphere for placement of the hole, with the idea that there are multiple holes that will each get patterned around the hemisphere (each would be a distinct pattern, with the attention of creating a distinct hole feature for each pattern. Any help would be appreciated.