Gims eco Can't normal export model

Please tell me why I have problems when I import and export normal EUP's ydd through GIMS.

The model can be successfully exported, but the exported model will be a mess in the game.

I didn't change or edit the model, just import and export.

Did I miss something or need a special bone?

An alert pops up when exporting the model：

[0 errors]
[1 warnings]
1 times:    Model "task_002_u/task_002_u" has got more than one root bone.
All of them will be grouped into a new one with default parameters and unique ID.
If you want to tweak these parameters, consider creating the root bone by yourself, and attaching your model bones to it.

Let me know if anyone knows what the problem is, thank you