Repost: svy with weights and mata run-time error r(3499)

[Renuka Metcalfe <rm18203@yahoo.co.uk>]

Dear Statalisters

I want to run an OLS employing weights given by the
data providers to account for its statified sample
design. They suggest issuing the following

.gen wpstr04=cell_no if cell_no<=17
(1945 missing values generated)

. replace wpstr04=(cell_no+1) if cell_no>=18
(1945 real changes made)

. recode wpstr04 (11/12=13) (17=16) (19/21=22)
(25/26=27) (36=35) (37=38) (40=41) (44=43) (59=60)
 (64=65) (82=83) (107=108)
(wpstr04: 154 changes made)


. svyset [pweight=empwtnr], strata(wpstr04)
vce(linearized)

      pweight: empwtnr
          VCE: linearized
     Strata 1: wpstr04
         SU 1: <observations>
        FPC 1: <zero>

where empwtnr=employment weight 

Then I run 

svy: regress y1 x1 x2 x3 (running regress on
estimation sample)

This is what I get

Mata run-time error
r(3499);

I would be grateful if anyone would let me know how
one can rectify the above error message and run the
regression. 

Many thanks




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