Error executing vim.schedule lua callback

[wsbky]

While coding in typescript, I got an error below.

Error executing vim.schedule lua callback: .../dein/.cache/init.vim/.dein/lua/lsp_signature/helper.lua:187: malformed pattern (missing ']')
stack traceback:
        [C]: in function 'findwholeword'
        .../dein/.cache/init.vim/.dein/lua/lsp_signature/helper.lua:187: in function 'match_parameter'
        ...he/dein/.cache/init.vim/.dein/lua/lsp_signature/init.lua:216: in function 'handler'
        ...w/Cellar/neovim/0.6.1/share/nvim/runtime/lua/vim/lsp.lua:964: in function 'cb'
        vim.lua:285: in function <vim.lua:285>

[ray-x]

what is the code signature it trying to complete? It may contain meta/special characters

[wsbky]

I got the error when typing inside () of the above method.

[ray-x]

Should be fixed.