Utau Synth Help

[Kumo Meron]

Hello, I'm new here. I'm trying to make my own Utau in Utau-Synth, but Utau-Synth won't create the spef file for one of my sounds. As a result, the program crashes whenever it tries to render that sound. I don't know what the issue is, considering that there's a spef file for other sounds. But even then, I have no idea how it got there because Utau-Synth crashes every time I want to update the spef, the frq, or both.