> I am getting the following error in amber7: 
> 
> Exceeding lastist in get_istack 
> lastist = 2000000 
> top_stk= 1377180 
> isize = 688590 
> request= 2065770 
> Increase lastist in the &cntrl namelist 
> 
> Where can I find this parameter ? 

simply add a line in your -i file: 
 &cntrl 
. 
. 
. 
lastist = 2500000, 

. 
. 
. 
 &end 


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   > About the lastist: In sizes.h it is advised to override the MAX_ISTACK 
   > value by defining indeed lastist in the &cntrl list. What is the limiting 
   > value that one can use for lastist? 

   Limited by available memeroy. 

   ..dac 

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