Exporting bar runs for a little while then closes on it's own without exporting the model

FUA

I have already exported the model once, but when I was testing the model in VTS I found mistakes, and went back to Live2D to fix those mistakes. As I tried exporting the model once again it refused to export and presented me with this ERROR message:
[ERROR] java.lang.NullPointerException
[ERROR] at com.live2d.cubism.doc.model.ACParameterControllableSource.getKeyForm(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.deformer.warp.CWarpDeformerSource.getKeyForm(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.q.a(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.v$a.j(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.v$a.g(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.v.a(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.b.a(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.b.a(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.d.a(Unknown Source)
[ERROR] at com.live2d.cubism.doc.model.exporter.d.invoke(Unknown Source)
[ERROR] at com.live2d.util.ab.a(Unknown Source)
[ERROR] at com.live2d.util.aa.a(Unknown Source)
[ERROR] at java.base/java.lang.Thread.run(Unknown Source)
Does anyone know what this means and how to fix it?

ookubo(staff)

Hi @FUA

Thanks for using our products.

Could you first tell us more about the environment you use?
▼ For question regarding Editor, please provide:
- Live2D Software Version: (e.g. Cubism Editor 4.0.01)
- OS & Version: (e.g. Windows 10, macOS HighSierra)
- PC Model: (e.g. MacBookPro 2017)
- Graphics Specifications: (e.g. GeForce GTX 950M)
- CPU: (e.g. Intel Core i7-7700)
- Memory: (e.g. 8GB)
- Illustration Software used: (e.g. Photoshop, ClipStudio, SAI)
- Attach screenshot or capture video to show your problem:

Secondly, please tell us as much as possible about where you have made modifications to the model and what operations you have performed that have caused the problem to occur.

In addition, please store the file(s) causing the problem in the data box below.
https://biz.datadeliver.net/posts/9wCCCxOwc2Lg

Best regards.