[Lazarus] what is wrong on this form?

[FreeMan]

I didn't understand what is problem, there is no component on form, I 
convert this. It has 2 tbutton and 1 TRadioGroup. I remove one by one 
but I couldn't find problem.
Open in IDE, then press F12 then get access violation
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object StyleForm: TStyleForm
  Left = 488
  Height = 240
  Top = 280
  Width = 320
  BorderStyle = bsDialog
  Caption = 'styles'
  Color = clBtnFace
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  LCLVersion = '1.3'
end
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