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operation cannot be called from this Process.

back to error messages

error dump


ERROR:
Primitive '_SCView_SetProperty' failed.

operation cannot be called from this Process.
RECEIVER:
Instance of SCSlider {    (03C17BD0, gc=5C, fmt=00, flg=00, set=03)
  instance variables [7]
    dataptr : RawPointer 1B58F60
    parent : instance of SCTopView (03C553E0, size=9, set=04)
    action : nil
    background : nil
    keyDownAction : instance of Function (03C5B290, size=2, set=01)
    keyUpAction : instance of Function (03C5B260, size=2, set=01)
    keyTyped : nil
}
CALL STACK:
	Object-verboseHalt
		arg this = <instance of SCSlider>
	Object-primitiveFailed
		arg this = <instance of SCSlider>
	SCView-setProperty
		arg this = <instance of SCSlider>
		arg key = 'value'
		arg value = 0.200000
	SCSlider-value_
		arg this = <instance of SCSlider>
		arg val = 0.200000
	< FunctionDef in closed FunctionDef >  (no arguments or variables)
	Routine-prStart
		arg this = <instance of Routine>
		arg inval = 2752.560649

how to cause it:

//when trying to access the application clock from the 
//system thread this causes this error.
//OSCresponder and Routine evaluate their functions by default in a SystemClock thread.

w = SCWindow("test", Rect(128, 64, 360, 160));
w.view.decorator = d = FlowLayout(w.view.bounds);
b = SCSlider(w, Rect(20, 50, 80, 24));
w.front;

b.value = 0.6;

Routine({ 0.1.wait; b.value = 0.2 }).play(SystemClock);

how to avoid it, if known

// use the {}.defer message.

w = SCWindow("test", Rect(128, 64, 360, 160));
w.view.decorator = d = FlowLayout(w.view.bounds);
b = SCSlider(w, Rect(20, 50, 80, 24));
w.front;

b.value = 0.6;

Routine({ 0.1.wait; defer({ b.value = 0.2 }) }).play(SystemClock);



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