Epiweek module and error message

Hi, I am trying to use the epiweek command in Stata/IC 11.2 (downloaded through the findit command in Stata)
I used the command:
epiweek invitedate3, epiw(epi_week) epiy(epi_year) (inviteweekdate3 is in %td format)
However I receive an error message: unexpected end of file (error occurred while loading epiweek.ado)
Any help would be appreciated?

Thanks Sally