QGtkStyle cannot be used together with the GTK_Qt engine

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yulq
QGtkStyle cannot be used together with the GTK_Qt engine

I've installed vapor 2.3.0 on Ubuntu 14.04 LTS and manully set up some system variables as vapor-setup.sh does not work as expected. (I've post another thread about this issue.)
When I issue the command:
$ ./vaporgui
I have got the message:
QGtkStyle cannot be used together with the GTK_Qt engine.
./vaporgui: symbol lookup error: ./vaporgui: undefined symbol: _ZN9QListData11detach_growEPii

Thanks.