Constructor - the both look the same

[Joel via Digitalmars-d-learn]

Why does it come up with this?

source/setup.d(40,16): Error: constructor inputjex.InputJex.this 
(Vector2!float pos, int fontSize, InputType type = 
cast(InputType)0) is not callable using argument types 
(Vector2!float, int, InputType)
dmd failed with exit code 1.