Why i cant apply Loft command properly in solidworks

There are 2 major problem in order to solve my problem ,making a fuselage .
1)While applying loft step by step (so that the curvature is maintained ),the guide curves disappears after the first loft command, from the model(What a magic)
2)Even if i tried doing directly the command say invalid thin feature
Below are the model ,please help me as a beginner.

Accepted answer

Sometime Loft feature doesn't work, use boundary boss command, but I am sure it is working here. Make sure to select right plane when you are using lofting feature. If you are using guide curves, select plane perpendicular to lofted planes. You can use boundary conditions (Start/End) if loft feature isn't working.


1 Other answer

Vasim, these files are for solidworks 2020, can you send them with .step?