Do you see how the green metric didn't work in my table though? It says it's invalid. Do you know why that is or how I can fix that?

@yuhuisg here are the screenshots. This same behavior happens for every metric. Adding segments, however, does not give invalid results. 

Hi, I'm new to Adobe Analytics and I'm trying to build a Freeform Table in Workspace. So far I have designated my report suite and added the correct page to my table. However, when I try to add a metric to my page, it's marked 'Invalid' and says 'you can only add a single metric to a report.' I'm co...