st: Error 3499 using synth ("emptymat() not found")

[Chris Hajzler <chajzler@gmail.com>]

Dear Statlist,

I am using Stata 10.1 on OSx 10.9.  I am trying to run the "synth"
package for Abadie et al's synthetic control method.  I was getting
one type of error initially, and managed to correct this by updating
my version as was suggested in the Statalist archives, using

- update all
- update swap

and reinstalling the synth package. However,  now when I use the
following synth command

synth y x1 x2, trunit(1) trperiod(2005001) nested keep(r_p_1_2005001,replace)


I encounter the following error:

 <istmt>:  3499  emptymat() not found

immediately following the "First Step: Data Setup" output.  I'm not
sure what it means.

I am just wondering if anyone has any experience with this, and if
anyone has any suggestions on how to address this issue.

Thanks in advance,
Chris
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