Advanced mass scaling

Hi,

 

I have a simulation which crashes after a while due to error ID 205 and 207 ('ENERGY ERROR LIMIT REACHED' and 'TOTAL MASS ERROR LIMIT REACHED'). I have tried to change mass scaling value, but nothing happened. my first question is what would be the reason of crash? Does it come from fast loading or caused by changing material properties to less stiff behavior?

Moreover, I tried to use AMS, but ran into an error:

ERROR ID :           55
** ERROR IN INPUT FORMAT
DESCRIPTION :
   -- OPTION : AMS
   -- BLOCK : /PROP/SHELL/20
   -- LINE : /END

It should be noted that /AMS is in the _0000.rad file and /DT/AMS  .67 .5E-3 in the 0001.rad (Engine).