Lavaan error: Multigroup multilevel mediation analysis

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Yingjie Yuan

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Aug 6, 2020, 8:09:15 AM8/6/20
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Hello everyone, 

I got an error message when modeling a multilevel mediation model (a 2-2-1 model, with 900 cases at level 1 and 300 units at level 2) across three groups (repeated measure, each unit is in three groups). 
The syntax is as follow:
multigroup.model<-' 
group: low   
level:1
DV~1
level:2
DV~b*IV+c*Med
IV~a*Med

group: moderate   
level:1
DV~1
level:2
DV~b*IV+c*Med
IV~a*Med

group: high
level:1
DV~1
level:2
DV~b*IV+c*Med
IV~a*Med
#indirect and total effects
ab:=a*b
total:=ab+c'

multigroup1<-sem(multigroup.model, data=df,cluster="RankID", group = "g", 
                 fixed.x = FALSE,std.lv = TRUE, h1 = TRUE)

Then I got this error message: "Error in if (fx.delta < tol) { : missing value where TRUE/FALSE needed". 


Can anyone help check if this syntax is correct? My aim is to test and compare this 2-2-1 multilevel mediation model across three conditions of the group variable (high, moderate, low). 

Also, can anyone advise how to solve this error?

Thanks a lot!

Yingjie
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