[gtkmm] G++ throws a no matching function when I try to compile my C++

[Nick Nolan <hellish comcast net>]

when I try to compile my gtkmm using program g++ throws me the following

mainWindow.cc: In constructor `MainWindow::MainWindow()':
mainWindow.cc:13: no matching function for call to `Glib::SignalProxy0<void>::
   connect(SigC::Slot1<void, MainWindow&>)'
/usr/include/gtkmm-2.0/glibmm/signalproxy.h:113: candidates are: 
   SigC::Connection Glib::SignalProxy0<R>::connect(const SigC::Slot0<R>&, bool 
   = true) [with R = void]


the revelent code is:

newGatewayButton.signal_clicked().connect(SigC::slot(&MainWindow::newGatewayPressed));

newGatewayButton is a button and I am trying to connect MainWindow::newGatewayPressed to the
clicked signal of the button.

can someone please tell me what I did wrong?
Thanks in advance

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