[R] error using method ls.ranking.capa.ident

Good Day I'm trying to run the generalized least square approach for my 2-additive problem, unfortunately this error appeared. I have tried to figure out the error from the mailing list but couldn't find the solution. Any help is highly appreciated. This is my source code: >a1 <- c(76.18, 61.84,

[R] error using method ls.ranking.capa.ident

I'm trying to run the generalized least square approach for my 2-additive problem, unfortunately this error appeared. I have tried to figure out the error from the mailing list but couldn't find the solution. Any help is highly appreciated. This is my source code: >a1 <- c(76.18, 61.84, 60.4, 69.