Error using the forecast function with the ets or nntar function

Question

I am trying to use the forecast() function in R on different ETS objects or NNTAR. I get the same error message everytime.

ets_model <- ets(trainingdata)

ets_forecast.pred <- forecast(ets_model, h=10)

I get the following error message:

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

The same problem occurs with nntar object to neural network and I use auto.arima function:

no applicable method for 'forecast' applied to an object of class "c('forecast_ARIMA', 'ARIMA', 'Arima')"

Answer 1

Apparently the problem can be solved by reinstalling the packages again. There was probably a problem or inconsistency. I hope the answer can help others who may have the same problem. Thanks for the personal space. Goodbye.