This is the syntax I used:
Title model 1 factor;
datafile Scale.txt ;
format responses 1-32;
codes 1,2,3,4,5;
score (1,2,3,4,5) (0,1,2,3,4);
model item + step;
estimate !abilities =yes, method = Montecarlo;
reset;
Title model 4 factors;
Datafile Scale.txt;
Format responses 1-32;
codes 1,2,3,4,5;
score (1,2,3,4,5) (1,2,3,4,5) () () () !items (1,2,3,4,5,6,7,8,9);
score (1,2,3,4,5) () (1,2,3,4,5) () () !items (10,11,12,13,14,15);
score (1,2,3,4,5) () () (1,2,3,4,5) () !items (16,17,18,19,20,21,22,23);
score (1,2,3,4,5) () () () (1,2,3,4,5) !items (24,25,26,27,28,29,30,31,32);
Model item+step;
Estimate ! abilities =yes, method=Montecarlo, nodes =2000;