I cannot tell you why you are experiencing this problem, to do so would require a thorough examination of your code. But in order to avoid the problem use a little defensive code:

if wexist('mycustomwindow')
  release window 'mycustomwindow'
endif

Glenn

>Hi,
>In my program I have defined a window.
>Later I realese the window from memory.
>But sometimes I get the error 214 saying that the window is not defined.
>Can anyone help me in why this error occurs?
>wanted the reply at the earliest.
>
>
>Thanks & Regards
>Francita