simulation failed with elc

[hatame]

hi
i work with elc for characterization cell. my config file is this

SETUP = "/home/test/cds/test/setup.ss"
PROCESS = "typical" 
SUBCKT = "/home/test/cds/test/inv.scs"
MODEL = "/home/test/cds/test/model-file.scs"

and my setup file is this

Process typical {
  voltage     = 1.8 ;
  temp        = 25 ;
} ;

Signal std_cell {
  unit        = REL ;
  Vh          = 1.0    1.0 ;
  Vl          = 0.0    0.0 ;
  Vth         = 0.5    0.5    0.5    0.5 ;
  Vsh         = 0.7    0.7    0.7    0.7 ;
  Vsl         = 0.3    0.3    0.3    0.3 ;
  tsmax       = 3e-09 ;
} ;

Simulation std_cell {
  transient   = 0.5n 5.18125e-08 1.67e-12;
  dc          = 0.26  1.04  0.01 ;
  bisec       = 2.59062e-08 2.59062e-08 1e-11 ;
  resistance  = 10MEG ;
  incir       = "" ;
  outcir      = "" ;
} ;

set process ( typical ) {
     simulation = std_cell;
     signal     = std_cell;
};

and command is this

db_open foo

# Set some variables to define how ELC does its stuff
set_var EC_SPICE_SIMPLIFY true
set_var EC_HALF_WIDTH_HOLD_FLAG true
set_var EC_SIM_NAME "spectre"
set_var EC_SIM_TYPE "spectre"
set_var EC_SPICE_SUPPLY1_NAMES "vdd"
set_var EC_SPICE_SUPPLY0_NAMES "gnd"

set_var EC_ELABORATE_MODEL 1

set_var EC_SPICE_NMOS_DEVICES "nch"
set_var EC_SPICE_PMOS_DEVICES "pch"

# run through the steps that read and parse the subckt file (defined
# in elccfg), and extracts the functionality of each cell
db_prepare -force
db_gate 

# Remove the next 3 lines to use the ipsd/ipsc
# deamons for load balancing on multiple machines
set_var sg_SPICE_SIMPLIFY true 
set_var EC_SIM_USE_LSF 1
set_var EC_SIM_LSF_CMD ""
set_var EC_SIM_LSF_PARALLEL 0 
# set up some things that let ELC know how to proceed

set_var EC_SIM_NAME "spectre"
set_var EC_SIM_TYPE "spectre"
set_var EC_SPICE_SUPPLY1_NAMES "vdd"
set_var EC_SPICE_SUPPLY0_NAMES "gnd"
set_var EC_HALF_WIDTH_HOLD_FLAG tru


# run spice (Spectre in this case) to do the actual characterization
db_spice -s spectre -p typical -keep_log
db_output -report foo.rep -alf foo.alf -p typical
db_close
exit

but when run db_spice command my simulation failed,every one know the cause of problem?