not a valid Qt plugin

I kept receiving this message in these 3 days:
[bbns@palisade ../qt3d/demos/declarative]$ /usr/local/qt4.7/bin/QMLViewer.app/Contents/MacOS/QMLViewer sphere.qml
file:///Users/bbns/Documents/library/qt/qt3d/demos/declarative/sphere.qml:42:1: plugin cannot be loaded for module "Qt3D": The file '/usr/local/qt4.7/imports/Qt3D/libqthreedqmlplugin.dylib' is not a valid Qt plugin.
import Qt3D 1.0

Never happened before on my Mac until I pulled Qt4.7 and Qt/3D master.

[bbns@palisade ../qt3d/demos/declarative]$ otool -L /usr/local/qt4.7/imports/Qt3D/libqthreedqmlplugin.dylib
/usr/local/qt4.7/imports/Qt3D/libqthreedqmlplugin.dylib:
libqthreedqmlplugin.dylib (compatibility version 0.0.0, current version 0.0.0)
libQt3DQuick.1.dylib (compatibility version 1.0.0, current version 1.0.0)
libQt3D.1.dylib (compatibility version 1.0.0, current version 1.0.0)
/usr/local/qt4.7/lib/QtDeclarative.framework/Versions/4/QtDeclarative (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtScript.framework/Versions/4/QtScript (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtCore.framework/Versions/4/QtCore (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtSvg.framework/Versions/4/QtSvg (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtGui.framework/Versions/4/QtGui (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtSql.framework/Versions/4/QtSql (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtXmlPatterns.framework/Versions/4/QtXmlPatterns (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtNetwork.framework/Versions/4/QtNetwork (compatibility version 4.8.0, current version 4.8.0)
/usr/local/qt4.7/lib/QtOpenGL.framework/Versions/4/QtOpenGL (compatibility version 4.8.0, current version 4.8.0)
/System/Library/Frameworks/OpenGL.framework/Versions/A/OpenGL (compatibility version 1.0.0, current version 1.0.0)
/System/Library/Frameworks/AGL.framework/Versions/A/AGL (compatibility version 1.0.0, current version 1.0.0)
/usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version 7.9.0)
/usr/lib/libgcc_s.1.dylib (compatibility version 1.0.0, current version 246.0.0)
/usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 125.2.1)