If the preset says "Cannot load due to different race/gender," you have tried to load a Lyn preset onto a Gon body. This is the most common error.
If you want to tweak a preset to make it your own, keep these rules in mind: Check Lighting Blade And Soul Presets
Use the preview animations on the left side of the creation screen. A face might look perfect while expressionless, but clipping or distortion can occur during laughing or crying animations. If the preset says "Cannot load due to