Get DFrames Width?

I am trying to adjust a button in the center of my dfame for X but not Y
I got this :

ButtonThingyLongNameForButtonHIFacePunch:SetPos(DframeThingy:GetSize():Width() / 2, 6)

But its giving me errors. 
Any suggestions?

Oof I am a retard xDD
I fixed it xDD

If someone is looking for a solution and you found this kid xdd didn’t post it, please, don’t ask us anything else anymore if you are not going to share the solution

But if you still need it, Use GetWide()

I didnt post it because in my situation it was different. GetWide didnt work for me