clmm specify initial values with argument 'B'.

Question

clmm r package erro: specify initial values with argument 'B'.how cn

for (i in 2:7) {

• mi <- hlme(fixed = bmi ~ 1+ age + I(age^2),
  

•            mixture = ~ 1 + age + I(age^2),
  

•            random = ~ 1 + age,
  

•            ng = i, nwg = TRUE, 
  

•            data = data.frame(a), subject = "id")
  

• lin <- rbind(lin, c(i, mi$BIC))
  

• }

Error in hlme(fixed = bmi ~ 1 + age + I(age^2), mixture = ~1 + age + I(age^2), :
Please specify initial values with argument 'B'****