First time enrollment help

I have applied for credit, and the first pic is my current course map (crossed out are exempted units). I am left with one elective, which I plan to take FIT1051 - Programming with Java.

My plan has been to move up the core units and shift FIT2102 to Year 1, Semester 2. However, when I attempt to enroll with this plan, I get an error message. Does anyone know what mistake I might be making or if there’s a solution?

I’ve done the Monash enquiry forms but they indicated they’ll reply late dec - early January