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st: problem with levpet command

From   Tuki <>
Subject   st: problem with levpet command
Date   Tue, 31 May 2011 16:23:01 -0700 (PDT)

Hi there,
I'm attempting to estimate firm-level productivity using panel data.
To do so, I'm using levpet command by Petrin et al(2004).
After removing all the duplicates and missing values and labelling the data
as  panel/time-series using xtset/tsset, I keep on receiving error message
"repeated time values within panel". surprisingly, I have no problem working
with opreg command by Yasar et al (2008). What is the solution?!

 Any suggestion is highly appreciable. 

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