I found that when using the Hot-Reload function of UE4, the Spine plugin will crash. The specific reason should be caused by the Json part. The following is a related screenshot

badlogic wrote

Are you hot reloading both the plugin code and the game module code, or only the latter? Do you have steps for me based on our UE4 example project that will reproduce the issue?

I just hot loaded the game module, in UE4Editor, create a new C++ based Actor, the engine will crash when it is hot loaded..

Sorry, I have solved it, the problem is on my own modified plugin problem.

Because I modified the Hot-reload failure caused by OptimizeCode.

badlogic wrote

Ah, good to know. UE4 hot reload is a bit hit and miss. I heard Live++ will be supported in UE 4.22+, so hopefully reload will be better in the future!

Yes, in the new version will use Live++,this problem is finally solved.. I can have time to continue back to the work of Spine Widget Animation..