C ++: Can not initialize a variable of type 'guiBaseObject *' with a value of type 'void'

I'm using openframeworks. This is based on C++.

I have the following code:

guiBaseObject *item = panel.addSlider("motor_speed", 0, 0, 100);

And I am unable to understand why I receive the following error.

/Users/CREATER/Documents/of_v0.8.4_osx_release/apps/myApps/MapamokStepper/src/MotorControl.cpp:38:20: Cannot initialize a variable of type 'guiBaseObject *' with an rvalue of type 'void'

If you want to have access to the slider, you can do something like this:

ofIntSlider motorSpeed;
panel.add(motorSpeed.setup("motor_speed", 0, 0, 100));

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