lavaan WARNING: could not compute standard errors!
lavaan NOTE: this may be a symptom that the model is not identified.
lavaan WARNING: could not compute scaled test statistic
lavaan WARNING: some estimated variances are negative

cfa.mod <- '
L1 =~ var1a+var1b
L2 =~ var2a+var2b+var2c+var2d
L3 =~ var3a+var3b+var3c+var3d
L4  =~ var4a+var4b+var4c
L5 =~ var5a+var5b+var5c
L6 =~ var6a+var6b+var6c
CMF =~ var1a+var1b+var2a+var2b+var2c+var2d+var3a+var3b+var3c+var3d+
var4a+var4b+var4c+var5a+var5b+var5c+var6a+var6b+var6c
CMF ~~ 0*L1+0*L2+0*L3+0*L4+0*L5+0*L6
'