Clear now
...well, almost! Your motors are named 53787_2.dat instead of 53787.dat. Same extraneous _2 for NXT, US sensor, Technic Pin Connector Perpendicular 3 x 3 Bent 90 with 4 Pins... This explains why LeoCAD didn't found these parts (but not where does these _2 come from???). You have also unknown (at least by me!) 21249200a, b and c...
...well, almost! Your motors are named 53787_2.dat instead of 53787.dat. Same extraneous _2 for NXT, US sensor, Technic Pin Connector Perpendicular 3 x 3 Bent 90 with 4 Pins... This explains why LeoCAD didn't found these parts (but not where does these _2 come from???). You have also unknown (at least by me!) 21249200a, b and c...