The letter is a template that was not completed correctly (perhaps not at all). For example, certain text should have been deleted by the Entry Clearance Officer (ECO) and replaced with more informative text. These phrases include "enter sponsor's name" and "enter the relevant regulation number(s) (see ECGs EUN2.23)."
Also note the self-contradictory nature of the letter: one paragraph explains that you may not appeal the decision, while the following section describes your right of appeal. Similarly, the letter notes that "it has not been necessary to interview you" immediately before claiming that "an interview with you" was considered in making the decision.
Most egregiously, the portion of the letter that should outline the ECO's reasoning is entirely absent. This should appear between the heading "The Decision" and the concluding paragraph beginning "I therefore refuse...." In this spot, however, there is only a single bullet with no associated text.
You should approach the Entry Clearance Manager (ECM) at the relevant consulate and request a properly completed notice.
See also UK visa blank refusal letter without reason for refusal at Travel.