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...attempt to test for a second order factor by adding the last 4 lines in the model, I get the error message below: model.cfa.ru <- specifyModel() sRU1 <- sRU, NA, 1 sRU2 <- sRU, lam12 sRU3 <- sRU, lam13 sRU4 <- sRU, lam14 sRU5 <- sRU, lam15 sRU6 <- sRU, lam16 sRU <-> sRU, mak1 sRU1 <-> sRU2, cors1 sRU5 <-> sRU3, cors2 sRU6 <-> sRU2, cors3 sRU6 <-> sRU1, cors4 pRU1 <- pRU, sfsf pRU2 <- pRU, lam22 pRU3 <- pRU, lam23 pRU4 <- pRU, lam24 pRU5 <- pRU, lam25 pRU6 <- pRU, lam26 pRU <-> pRU, mak1 pRU5 <-> pRU3, corp1 pRU4 <...