Hi all, I define a class below to do some basic directory management. The release line in the destroy method does not compile. Any idea? Thanks!

define class CDir as custom
   hidden sDir
   hidden oShell
   sDir= ""
   oShell= .null.
   function init
      this.sDir= sys(5)+sys(2003)
      this.oShell= createobject('WScript.Shell')
   function destroy
      cd (this.sDir)
      && release this.oshell && Error: must be a variable or array
      this.oShell= .null.
   function MyDocuments
      cd (this.oShell.SpecialFolders("MyDocuments"))
enddef