question on autolayout in wNim

[oyster]

in my simple code, there is a spacing of 50 between text control and frame 
border. However if I use 
    
    
    H:|[label, groupText]|
    
    
    Run

when run the EXE, I get 
    
    
    E:\prg\nim\nim-1.0.6\lib\core\macros.nim(581) layout
    C:\Users\USER\.nimble\pkgs\wnim-0.10.1\wNim\private\wResizer.nim(52) 
addConstraint
    C:\Users\USER\.nimble\pkgs\wnim-0.10.1\wNim\private\kiwi\solver.nim(74) 
addConstraint
    Error: unhandled exception:  [UnsatisfiableConstraintException]
    
    
    Run

so how to fix it? thanks
    
    
    import strutils, wNim
    
    let app = App()
    let frame = Frame()
    let panel = Panel(frame)
    let label = StaticText(panel, style=wBorderSimple, label=" ".repeat(20))
    let text = TextCtrl(panel)
    let btnClick = Button(panel, label="Click")
    let btnClose = Button(panel, label="Close")
    
    proc layout() =
      panel.autolayout """
        H:|{groupButton:[btnClick(btnClose)]-[btnClose]}|
        H:{groupText:|-50-[text]|}
        V:|[label]-[groupText]-[groupButton]|
        H:|[label, groupText]|
      """
    panel.wEvent_Size do (): layout()
    
    layout()
    frame.center()
    frame.show()
    app.mainLoop()
    
    
    Run