> model <- ' SUD.sum =~ Alc.Sum+Drug.Sum+MJ.Sum
+ BPD.Sum ~ TAI.SUM + mBDIII.SUM
+ SUD.sum ~ BPD.Sum + TAI.SUM + mBDIII.SUM
+ mBDIII.SUM ~~ mBDIII.SUM
+ TAI.SUM ~~ TAI.SUM
+ mBDIII.SUM ~~ TAI.SUM
+ BPD.Sum ~~ BPD.Sum
+ SUD.sum ~~ SUD.sum'
> fit <- lavaan(model, estimator = 'MLF', data=df)
Error in lav_model_estimate(lavmodel = lavmodel, lavpartable = lavpartable, :
lavaan ERROR: initial model-implied matrix (Sigma) is not positive definite;
check your model and/or starting parameters.