Hi,
You are getting an error because this is the only table in your model so far, correct?
Import some other data containing dates and see if this works.
Reference:
https://community.powerbi.com/t5/Desktop/CALENDARAUTO-Function-not-working-properly/td-p/1297281
EDIT:
Further reading
https://endjin.com/blog/2018/06/using-calendar-vs-calendarauto-to-generate-date-table-for-year-on-ye...
The 'Previous Year Sales' will, of course, be blank – because there are no data entries for the previous year. However, care needs to be taken for the final date entries in your date table. This is where it becomes important to understand the possible differences between generating a date table using the CALENDAR function and CALENDARAUTO function.
The CALENDAR function generates a date table, outputting every day between two dates you specify as parameters (inclusive). Of course, these parameters can be hard-coded, or a function that outputs a date based on your chosen date column can be used (which is probably more preferable for dynamic data models).
For example, the FIRSTDATE and LASTDATE functions can be used in the arguments to extract the earliest and latest dates that appear in whatever date column you wish to use to generate your date table.
CALENDARAUTO works slightly differently. CALENDARAUTO will output a date table with every day from the first day of the fiscal year based on the earliest date in your chosen date column, all the way up to the last day of the fiscal year of the latest date in your chosen date column. It takes one optional parameter ([fiscal_year_end_month]) whereby you can enter an integer between 1 and 12 to choose as the end of your fiscal year. The default is 12 (31st December).
