hi, I use the newest version but I got the following issue:

2021/03/24 09:25:19 [error] 6112#54059: *13 lua entry thread aborted: runtime error: /usr/local/share/lua/5.1/resty/etcd/v3.lua:487: attempt to index field 'serializer' (a nil value)

I believe serializer default is json as the doc mention in v3.md. Nvm, I set it to json manually, but I got error message instead , I believe is the same issue.

2021/03/24 09:20:19 [error] 5976#50240: *13 lua entry thread aborted: runtime error: /usr/local/share/lua/5.1/resty/etcd/v3.lua:487: attempt to call field 'deserialize' (a nil value)

Could you help look into this? Thanks in advance