monitor blank area of window for any change

[AggieBQ1972]

Somehow I am getting an error running this macro. Oudtpu box gives the following error:
Error in <open ":1: /179">BlankAreaCk:  empty block. Did you forget to tab-indent following lines?.
No lines were mentioned other than this error message
Can you see anything?


RECT r
SetRect &r 2000 326 3500 500

int w=win("WSJT-X   v2.0.0   by K1JT" "Qt5QWindowIcon")
out 1
wait 0 -S "" w r 16
out 2
rep


#region Recorded 1/21/19 10:43:15 AM
int w1=win("WSJT-X   v2.0.0   by K1JT" "Qt5QWindowIcon")
lef 2926 1056 w1 1 ;;push button 'Halt Tx Alt+H'
lef 3652 1388 w1 1 ;;radio button
lef 1748 1060 w1 1 ;;push button 'Erase Alt+E'
lef 2456 1062 w1 1 ;;check box 'Enable Tx Alt+n'
#endregion