Error in undefined Columns

[pashtun]

Hello all,

I am new to RStudio and have a problem when loading the package 'lcmm' from my data.
This is the following code I am using:
'
library(lcmm)
dat = baseline4_0
lcmm11 <- lcmm(K1 ~ poly(year, degree = 1, raw = TRUE), random =~ year,
subject = 'nsin', data = dat, ng = 1, link = 'linear')
'

No matter what I do, I keep getting the error:
Error in [.data.frame(newdata, , nom.subject) :
undefined columns selected

Thanks in advance for your help.

[andresrcs]

We don't really have enough info to help you out. Could you ask this with a minimal REPRoducible EXample (reprex)? A reprex makes it much easier for others to understand your issue and figure out how to help.

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…