What exactly are you trying to achieve?
The month-from-DateTime function returns the integer value of the month of the given date (see XPath Month-From-DateTime | Mendix Documentation). That said your current solution attempts to compare an integer with a dateTime attribute.
If you want to retrieve all the items for the current month you might want to try:
Alternatively, you can amend your XPath to the following:
Note that this solution will give you all the objects whose PresentDate attribute is (using September as an example) September, regardless of the year
Parse your date like this to get your month in numbers