Error in predicting future values using UCM (Unobserved Components Model)

Hey there,

I'm new in this forum. So if there are any missing information in the question I will deliver those as best as I can.

I'm using a Unobserved Components Model (rucm package) to predict future values using several independent variables.

Demand <- read.csv2("Demand.csv") 
# e.g. sample(x = 800 : 15000, size =46)
Cars <- read.csv2("Cars.csv")
#e.g. sample(x = 500 : 800, size =46)
Duration in min (1-60), Distance in m(300 and 3000) Rain in mm (between 0 and 500), Sun hours (0-12), Temperatur in °F (1 to 80), Wind in kmh (0 to 80)
Multivariate_DataFrame <- data.frame(Demand, Cars, Duration, Distance, Rain, Sun, Temperature, Wind)


ucm_xyz <- ucm(formula = Demand ~ Cars + Duration + Distance + Rain + Regulars + Sun + Temperature + Wind, data = Multivariate_DataFrame, level = TRUE, slope = TRUE, irregular = TRUE, season = TRUE, season.length =12)


SSModel(formula = as.formula(ssm.formula), data = data, H = H)

State space model object of class SSModel

[1] Number of time points: 46
[1] Number of time series: 1
[1] Number of disturbances: 3
[1] Number of states: 21
Names of the states:
 [1]  Cars Duration Distance Rain Regulars Sun Temperature 
 [8]  Wind level slope sea_dummy1 sea_dummy2 sea_dummy3 sea_dummy4     
[15]  sea_dummy5 sea_dummy6 sea_dummy7 sea_dummy8 sea_dummy9 sea_dummy10     sea_dummy11  
Distributions of the time series:
[1]  gaussian

Object is a valid object of class SSModel.

The summary function states that model has the length of 14, Class is SSModel and Mode is list.

When forecasting:

predict(ucm_xyz["model"],n.ahead = 6, newdata = Multivariate_Dataframe)

The error message:

Error in UseMethod("predict") : 
  no applicable method for 'predict' applied to an object of class "list"


Any help would be fantastic

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