Knob quark broken?

Hello,
I installed the Knob quark and tried the following example from the help file:

// examples
(
var window, size = 32; // try different sizes - from 15 to 200 or more!
window = SCWindow.new("Knob", Rect(640,630,270,70)).front;
k = Knob.new(window, Rect(20, 10, size, size));
k.action_({|v,x,y,m| postf("action func called: %\n", v.value); });
//k.color[1] = Color.gray(alpha:0);
)

The error message is attached below.
Any help in fixing this?

Iannis Zannos

 =======================================================================

ERROR: Message 'knob' not understood.
RECEIVER:
   nil
ARGS:
CALL STACK:
    DoesNotUnderstandError:reportError   15E818B0
        arg this = <instance of DoesNotUnderstandError>
    Nil:handleError   15E81850
        arg this = nil
        arg error = <instance of DoesNotUnderstandError>
    Thread:handleError   15E81AF0
        arg this = <instance of Thread>
        arg error = <instance of DoesNotUnderstandError>
    Object:throw   15E817F0
        arg this = <instance of DoesNotUnderstandError>
    Object:doesNotUnderstand   15E81610
        arg this = nil
        arg selector = 'knob'
        arg args = [*0]
    Knob:init
ERROR: Message 'knob' not understood.
RECEIVER:
   nil
ARGS:
CALL STACK:
    DoesNotUnderstandError:reportError   1600D310
        arg this = <instance of DoesNotUnderstandError>
    Nil:handleError   1600D2B0
        arg this = nil
        arg error = <instance of DoesNotUnderstandError>
    Thread:handleError   1600D3D0
        arg this = <instance of Thread>
        arg error = <instance of DoesNotUnderstandError>
    Object:throw   1600D370
        arg this = <instance of DoesNotUnderstandError>
    Object:doesNotUnderstand   1600CE90
        arg this = nil
        arg selector = 'knob'
        arg args = [*0]
    Knob:init   164E4630
        arg this = <instance of Knob>
        arg parent = <instance of SCWindow>
        arg bounds = <instance of Rect>
        var size = nil
        var widthDiv2 = nil
        var center = nil
    < closed FunctionDef >   1600CEF0


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