multilevel cross-lagged model

[eline....@gmail.com]

Hi,

I have a question with specifying a multilevel cross-lagged model, in which school is the second level.

Model below and structure in attachment.

No specific second level covariates are of interest so I thought to use the same model at both levels.

However I'm running into the error: lavaan WARNING: the optimizer warns that a solution has NOT been found!

So I should misspecify something.

model<-'

level:1

CD~BD+BS

CS~BD+BS

DD~CD+CS+BD+BS

DS~CD+CS+BS+BD

BS~~BD

CS~~CD

DS~~DD

level: 2

CD~BD+BS

CS~BD+BS

DD~CD+CS+BD+BS

DS~CD+CS+BS+BD

BS~~BD

CS~~CD

DS~~DD'

fit <- sem(model,cluster="SCHOOL",optim.method = "em",data=data)

Thanks in advance.

Eline