Any idea why I would get this error using this code below?

Code:
  
 $mydocuments=ReadValue("HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Shell Folders","Personal")
 $cmd='$installfolder\xxcopy "'+$mydocuments+'" "'+$udocuments+'" /bi /s /yy /oa$uxxcopylog'
 ? 'Executing : '+$cmd
 Shell '%COMSPEC% /c '+$cmd
 If @error <>0
       $writelog = WriteLog2($logfile,"@USERID on @WKSTA with @serror My Documents Copy",1)
 EndIf
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I could have made a neat retort but didn't, for I was flurried and didn't think of it till I was downstairs.
-Mark Twain