Erro on popup btnbmp

[Silvio.Falconi]

this morning is go out this errror...

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Error description: Error BASE/1004  Metodo non disponibile: END
   Args:
     [   1] = U  

Stack Calls
===========
   Called from:  => END( 0 )
   Called from: .\source\classes\BTNBMP.PRG => TBTNBMP:SHOWPOPUP( 2046 )
   Called from: source\PSpiaggia.prg => (b)CHANGE_PLAN( 836 )
   Called from: .\source\classes\BTNBMP.PRG => TBTNBMP:CLICK( 697 )
   Called from: .\source\classes\BTNBMP.PRG => TBTNBMP:LBUTTONUP( 983 )
   Called from: .\source\classes\CONTROL.PRG => TCONTROL:HANDLEEVENT( 1791 )
   Called from: .\source\classes\BTNBMP.PRG => TBTNBMP:HANDLEEVENT( 2006 )
   Called from: .\source\classes\WINDOW.PRG => _FWH( 3546 )
   Called from:  => WINRUN( 0 )
   Called from: .\source\classes\WINDOW.PRG => TWINDOW:ACTIVATE( 1078 )
   Called from: source\main.prg => TAPPLICATION:ACTIVATE( 407 )
   Called from: source\main.prg => MAIN( 77 )

on Change_Plan there is

oApp:aBmps[nY,nX]:baction:= {|Self|::ShowPopUp( { |oBtn| BtnPopMenu( oBtn ) } )}