-- Library's

r_lfsr(2) <= r_lfsr(0) xor r_lfsr(1);
      r_lfsr(1) <= r_lfsr(2);
      r_lfsr(0) <= r_lfsr(1);
   end if;

else
-- line 75 (the error)
  freq_8kHz: while (counter <= maxcount) loop
      counter <= counter + 1;
   end loop freq_8kHz;