Most probably a typo error in your layout proc()
    
    
    proc layout() =
      panel.autolayout """
        H:|{groupButton:[btnClick(btnClose)]-[btnClose]}|
        H:|{groupText:[-50-[text]]}|
        V:|[label]-[groupText]-[groupButton]|
        H:|[label, groupText]|
    
    
    Run

This template works, at least no error after compilation. By the way not sure 
it is the layout you want. 

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