Sorry, add in your <core: ...> xmlns:l="sap.ui.commons.layout"
and write before every ..MatrixLayout:
<l:MatrixLayout>
<l:MatrixLayoutRow>
<l:/MatrixLayoutRow>
and so on.
sap.m.* does not provide a MatrixLayout so we have to use the sap.ui.commons.layout.MatrixLayout
Hope it will work now
check also: