Can't animate skinned meshes in Roblox Studio

So, I just learned how to use blender for Roblox skinned mesh rigging, once I finished the rig and exported it as an FBX. I imported it into Roblox using the Avatar plugin that came with Roblox Studio. And when I imported it and opened up the Roblox animator I got this message.
Help me
And here’s what’s in the rig.
Help me 2
I can’t find a way to fix this so it would be very nice if someone could help me.