Not sure whether it is a bug or expected behavour, but loading this extension plugin before any colorscheme throws error

[charlie39]

Describe the bug
A clear and concise description of what the bug is.

Just letting you know anyway since i didn't find any mentioed of it anywhere:

Loading this before any colorscheme throws a bunch of errors. Lazy loading with packadd. Tried with the aurora colorscheme and a bunch of base16 colorscheme.

Steps to reproduce
Steps to reproduce the behavior.
Please also paste the code which has buggy highlighting here.
try loading it before the mentioned colorschemes.

packadd aurora
packadd nvim-ts-rainbow

Error log :

Error detected while processing /home/charlie/.config/nvim/init.lua:
E5113: Error while calling lua chunk: /home/charlie/.config/nvim/init.lua:195: Vim(lua):E5108: Error executing lua
 ...pack/packer/opt/nvim-ts-rainbow/lua/rainbow/internal.lua:25: attempt to index a nil value
stack traceback:
        ...pack/packer/opt/nvim-ts-rainbow/lua/rainbow/internal.lua:25: in main chunk
        [C]: in function 'require'
        [string ":lua"]:1: in main chunk
        [C]: in function 'cmd'
        /home/charlie/.config/nvim/init.lua:195: in main chunk
stack traceback:
        [C]: in function 'cmd'
        /home/charlie/.config/nvim/init.lua:195: in main chunk
Error detected while processing BufReadPost Autocommands for "*":
Error executing lua callback: /usr/share/nvim/runtime/filetype.lua:20: Vim(append):Error executing lua callback: .
..er/start/nvim-treesitter/lua/nvim-treesitter/configs.lua:485: loop or previous error loading module 'rainbow.int
ernal'
stack traceback:
        [C]: in function 'resolve_module'
        ...er/start/nvim-treesitter/lua/nvim-treesitter/configs.lua:485: in function 'detach_module'
        ...er/start/nvim-treesitter/lua/nvim-treesitter/configs.lua:499: in function 'reattach_module'
        ...er/start/nvim-treesitter/lua/nvim-treesitter/configs.lua:109: in function <...er/start/nvim-treesitter/
lua/nvim-treesitter/configs.lua:108>
        [C]: in function 'nvim_buf_set_option'
        /usr/share/nvim/runtime/filetype.lua:20: in function </usr/share/nvim/runtime/filetype.lua:11>
stack traceback:
        [C]: in function 'nvim_buf_set_option'
        /usr/share/nvim/runtime/filetype.lua:20