I have a verilog-ams block of low pass fitler...

analog
     begin
                 
           V(filt_out) <+ laplace_nd(I(filt_in), {1,r1*c1}, {0, c12 , r1*c1*c2+ r2*c3*c12, r1*r2*c1*c2*c3}) ;

     end

i have initialised r1,r2,c1,c2,c12,c3 as real and proper values
when i simulate i get the following error

       coefficient of the highest power of `s' filterdenominator is zero.This
       error commonly arises if the coefficients are initialized inside an
       @initial_step statement that does not account for the analysis during
       which this error was reported.

I am new to Verilog-AMS so dont know where i am going qrong ..

I will try setting the values instead of variables

the first co-efficient is the lowest power of s -- atleast according to Verilog LRM manual.