This formula is invalid or incomplete: 'Calculation error in measure 'Query1'

Hi i got a error: This formula is invalid or incomplete: 'Calculation error in measure 'Query1'[all vulnerabilities]: A single value for column 'Date' in table 'Calendar' cannot be determined. This can happen when a measure formula refers to a column that contains many values without specifying an aggregation such as min, max, count, or sum to get a single result.'.