[SI-LIST] internal timestep too small in transient analysis HSPICE

I am using HSPICE verion 2007.9 and encountered an error saying " internal 
timestep too small in transient analysis". I didn't set tstep in .tran or 
RUNLVL or ACCURATE. I think the timestep is determined by the source sampling 
interval in the sub circuit by default. Changing the circuit connection on the 
top level can run the program without the running error, but I am wondering 
what might cause 'internal timestep too small" error.   
   
  I will apprecaita any discussions. Thank you very much.
   
   
  Shaohua
       
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