Problem creating new automated reports

I'm trying to set up reports in The Hub for a site that I just added. I've set them up for many other site without issue but this time for some reason I am running into a weird problem.

When I get to the part of the setup where I customize the report, when I hit "Continue" I get an error message that I need to fill out all required fields before I can continue. I have every field filled out except for the optional summary field. Even if I add some text to the summary, so that every field on the whole page filled out, I still get the error message.

Thanks in advance for your help!