VWAP doesnot work ?

["Theo E.M. Lockefeer" <sky40912@xxxxxxxxx>]

Hello friends,
 
I copied and pasted the VWAP formula from the december 2000 
article from Michael Tanksley (TASC) from the equis site but i
cannot get it to work :  any help very 
welcome.
 
Thanks in advance 
 
Theo Lockefeer