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configuration does not create .nc file but archivo.part

 I am trying to configure ichthyop 3.3 with ROMS outputs
The preview worksvery well, the configuration too
however, when it finishes I wanted to see the maps and the messaje 

Saving variables...

ichthyop[info] Closed NetCDF output file.

ichthyop[info] ===== Simulation completed =====

ichthyop[info] [Mapping] Opened NetCDF file

ichthyop[severe] null | java.lang.NullPointerException

ichthyop[severe] null | java.lang.NullPointerException
it does not create the.nc file but only archivo.part
This happens when I tried a simulation with 2 release zones, 90 days of transport duration
However, when I tried the same but 10 days of transport duration ir works, finish the file.nc
and makes the maps
What is the problem? 

How can I solve this problem?
Thank you very much

Hydrodynamic dataset: 
Java version: 
Java SE 8
Operating system: 
Windows 8

Check if this is not due to a memory problem by applying the solution given here http://www.ichthyop.org/forum/memory-problem