JSON file error

[Barashka02]

Error executing vim.schedule lua callback: ...unov/.local/share/nvim/plugged/ai.
vim/lua/_ai/openai.lua:83: Expected comma or object end but found T_END at chara
cter 336
stack traceback:
[C]: in function 'decode'
...unov/.local/share/nvim/plugged/ai.vim/lua/_ai/openai.lua:83: in funct
ion 'on_stdout_chunk'
...unov/.local/share/nvim/plugged/ai.vim/lua/_ai/openai.lua:14: in funct
ion <...unov/.local/share/nvim/plugged/ai.vim/lua/_ai/openai.lua:13>

I get this error after running <control + a>

Also is it possible to use gpt-4 if I pay for it with this?