PROC NLMIXED DATA = bb_long ;
      b_0 = 1;
      b_1 = 5;
          traject = b_0 + (b_1-b_0)*(1/(1 + exp(-alpha*(time-lambda))));
          MODEL bb_tstage ~ NORMAL( traject, v_e);
     RANDOM alpha lambda ~ NORMAL([m_alpha, m_lambda], [v_alpha, cov_alam, v_lambda])
      SUBJECT=id out=timing_tempo;
          PARMS m_alpha = .7
      m_lambda = 11.3
      v_e = 0.6
      v_alpha = 1.0
      cov_alam = -.3
          v_lambda = 1.5;
RUN;
一直出现ERROR: Quadrature accuracy of 0.000100 could not be achieved with 31 points.  The achieved accuracy was 1.000000.怎么修改参数都不行，求助各位，拜托拜托！