run stopped (UBCHCK)

Dear FLUKA experts and users,

I am trying to run an input containing a voxel geometry surrounded by concrete
walls (Geometry modelling was done using cutting surfaces as it is
recommended). In case it plays a role, the beam particles are low energy
neutrons. The input is running but after a certain number of particles the run
stops.

I receive the following error message written at the end of the *.out and
.*err file:
"Abort called from UBCHCK reason IXYZ-1 Run stopped! STOP IXYZ-1"

The geometry is well checked against errors. The same geometry input ran
successfully with different voxel geometry some time ago.
Is the problem associated with the USRBIN cards? Cartesian and region binnings
are included in the input, but the usage of these cards is ok.

Could somebody please explain me the reason / meaning of this error message?

Thanks in advance!

Andrea Zechner
Received on Thu Sep 16 2010 - 16:57:59 CEST