Babylon exporter plugin for blender is having issues exporting a manual bone setup with animation

I used a manual bone setup to this model, still having issue, the animation lost and still got a error messages.

I attached the 2 files both blender file and the converted .babylon

you can explore the file
[monsterA.zip](https://github.com/BabylonJS/BlenderExporter/files/4998288/monsterA.zip)

Start by opening the attached monsterA.zip and comparing the Blender file with the converted .babylon file. Reproduce the export with the manual bone setup, record the reported errors and missing animation, and use the comparison to define a fix; done means the animation exports without those errors.

Written by the indexing model from the issue text.