Please also provide the following information in addition to your question:

- Operating System: Windows
- brms Version: 2.9.0

I am trying to plot the interactions of a model with the following structure.

```
mod1 = brms::brm(Y ~ A*B+
C*B+
D + E+ F+
(1 |G) + (1|H),
control = list(adapt_delta = 0.99, max_treedepth = 10),
iter = 10000,
cores = 4,
data = dat6,
family="categorical")
```

the expression marginal_effects(mod1, categorical = T) gives me the following warning.

```
Warning message:
Interactions cannot be plotted directly if 'categorical' is TRUE. Please use argument 'conditions' instead.
```

I am not sure how to set the conditions, but looking at examples in the help page I tried:

```
conditions <- data.frame(A = c(-1, 0, 1))
marginal_effects(mod1, effects = "A:B",
conditions = conditions)
```

but I get the error

`Error: Please set 'categorical' to TRUE.`

Does anybody have an example to plot interactions in categorical models?

Thanks for any suggestion.