Shoutbox

Wnd is usually a Plus! window that you have opened. Either the variable Wnd is not created or the variable is being declared in the wrong scope (local instead of global).

To make sure the variable is in the right scope, put "var Wnd;" outside all functions and change the line that opens the window to "Wnd = MsgPlus.CreateWnd('interface.xml', 'myWindow');"

If that gives the same error  then the window is just not being created, possibly due to an error in the XML markup