Hi thanks for the purchase.
I've added an updated version of spine (v4.0.19) for download. The previous version was 3.8.xx
The newest spine to unity version uses spine version 4.0 so the problem might have been a version mismatch.
Important! You need to add .txt behind the atlas like below. 
Let me know if it stii didn't work.
Thank you
Hey, thanks for support very fast, i still got this error, i've recorded in this video, i use unity 2020.3.7f1 & spine unity v4.0, may i missing something? I really like this assets, please help T_T, thanks.
hmm ok. I've updated a few things. Can you download the spine json v4.0.19 file again? Should work now
Yessssssss, It's work perfectly now,
Many many thanks for your support ^^. Have a nice day!!!
