Specifying class for margins prediction after fmm

[Stephen Thomas]

According to the documentation for fmm postestimation, the margins command can predict latent class probabilities for any class:

Syntax for margins
...
classpr defaults to the first latent class if option class() is not specified.

However, if I try to specify a class, I get an error:

use https://www.stata-press.com/data/r16/mus03sub
quietly fmm 3, lcprob(totchr): regress lmedexp income c.age##c.age totchr i.sex
margins, predict(classpr) class(2)

option class() not allowed

I would be grateful if someone could tell me what I am doing wrong.

Thanks

[Stephen Thomas]

Answering my own question here, but in case someone else stumbles upon the same problem, the correct syntax is

margins, predict(classpr class(2))