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Why does R display this Error message : wrong number of dimensions?

I am trying to model a time series with two hexogenous series, however when I try to test the model on the test partition the result is this message.
Warning message:
In forecast.forecast_ARIMA(model, xreg = cbind(test_EX1, test_EX2, :
xreg contains different column names from the xreg used in training. Please check that the regressors are in the same order.