Obscure and misleading warning: QML Rectangle: cannot specify...

I came across a QML warning, it is:
"QML Rectangle: cannot specify top, bottom and vCenter properties..."
Actually, I got angry and just don't understand why, the message just make it look like a bug, I thought: "What the hell? QML doesn't allow specifying top for rectangles, it's ridiculous!". Then it becomes a headache to get rid of that warning.
While in fact, it's my fault and the message should be like this:
"QML Rectangle: cannot specify top, bottom and vCenter AT THE SAME TIME".

May be I was too foolish to not figure it out and then blame QML, but foolish guys are not very rare in this world