Question about PC Part Picker compatibility

jingwen91

Commendable
Jun 1, 2016
2
0
1,510
Was adding parts to build my first PC when this error is shown,

Fractal Design Define Nano S Mini ITX Desktop Case and Gigabyte GA-B85M-DS3H-A Micro ATX LGA1150 Motherboard are not compatible.

Is there a reason why it is not compatible?
 

jingwen91

Commendable
Jun 1, 2016
2
0
1,510



Does that mean I can't use this case? Sorry, this is my first time building a PC