DSFLUX ?

Hi Every one, 

I noticed one thing about specifying surface flux in abaqus/cae.  I specify user-defined surface flux in abaqus/cae, but the inp-file  writes *DsFlux as seen in the following lines,

** LOADS
**
** Name: Load-1   Type: Surface heat flux
*Dsflux
_PickedSurf28, SNU, 10.

When I submit the Job, I see this error

Error in job Essai: USER SUBROUTINE DFLUX IS MISSING
Job Essai: ABAQUS/Standard aborted due to errors. 

Can one help me