DSLR ideal exposure settings

I have been trying to get this to work since I got the program and finally decided to ask the community. So I have this data entered in for my canon 700d

Scale 1.10
Readout noise 2.7
Pixels 5184 x 3456
Gain .075

No matter what I do the ideal exposure stays N/A. Is it broke for DSLR’s or am I doing something wrong. I can’t find one thread in here where a DSLR user has gotten it to work.