Error providing regressors rank defficient


I was trying to fit an ARIMA model and I found the issue below :

arima <- data_tsbl_cv2 %>%
arima= ARIMA(Prices.BE ~ trend() + Generation_BE + Generation_FR + (holidaysBE == 1)))

Provided exogenous regressors are rank deficient, removing regressors: `holidaysBE == 1TRUE

What could be?

Your holidaysBE variable is probably a constant.

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