[-O]verwriting output

File Assignments:
|  MDIN: pvcl20_heat.in                                                        
| MDOUT: pvcl20_heat.out                                                       
|INPCRD: pvcl20_min.rst                                                        
|  PARM: pvcl20.prmtop                                                         
|RESTRT: pvcl20_heat.rst                                                       
|  REFC: pvcl20_min.rst                                                        
| MDVEL: mdvel                                                                 
| MDFRC: mdfrc                                                                 
|  MDEN: mden                                                                  
| MDCRD: heat.netcdf                                                           
|MDINFO: mdinfo                                                                
|  MTMD: mtmd                                                                  
|INPDIP: inpdip                                                                
|RSTDIP: rstdip                                                                
|INPTRA: inptraj                                                               


 Here is the input file:

Heat                                                                           
 &cntrl                                                                        
  imin=0,                                                                      
  ntx=1,                                                                       
  irest=0,                                                                     
  nstlim=100000,                                                               
  dt=0.002,                                                                    
  ntf=2,                                                                       
  ntc=2,                                                                       
  tempi=0.0,                                                                   
  temp0=300.0,                                                                 
  ntpr=500,                                                                    
  ntwx=10000,                                                                  
  cut=999.0,                                                                   
  ntb=0,                                                                       
  ntp=0,                                                                       
  ntt=3,                                                                       
  gamma_ln=2.0,                                                                
  ig=-1,                                                                       
  ioutfm=1, ntwv=-1                                                            
 /                                                                             
                                                                               

--------------------------------------------------------------------------------
   1.  RESOURCE   USE: 
--------------------------------------------------------------------------------

| Flags:                                                                        
|    NONPERIODIC   ntb=0 and igb=0: Setting up nonperiodic simulation
|Largest sphere to fit in unit cell has radius =       NaN
ASSERTion ' n > 0 ' failed in ew_setup.F90 at line    306.