Clarification on step to create the date_year variable at the recipe_spec_timeseries step

[africanobyamugisha]

On Using modetime , you dont clarify on the creating of the date_year variable at the step of creating the recipe that is recipe_spec_timeseries

juice(prep(recipe_spec_final))
Error in step_normalize():
Caused by error in prep(): ! Can't subset columns that don't exist.
Column date_year doesn't exist.