File lsp-mode is a symbolic link about config

[MaskRay]

Debugger entered--Lisp error: (void-variable c-c++modes)

This is defined in the +lang/c-c++ layer
layers/+lang/c-c++/config.el:(defconst c-c++-modes '(c-mode c++-mode)

I may have misspelled the name in an older version of my config.

I checked the Lisp code in file .emacs.d/private/+my/my-code/packages.el and I think the error may be related to the missing file lsp-mode under directory .emacs.d/private/+my/my-code/local(I know nothing about the Lisp programming language... ). Besides, I found other symbolic files using the command below:

Yes. I have local emacs-cquery, lsp-mode and lsp-ui repositories in ~/Dev/Emacs/{emacs-cquery,lsp-ui,lsp-mode} and these +my/cquery/local/{cquery,lsp-mode}` are symlinks pointing to them.

You can just replace (lsp-mode :location local) with lsp-mode in the package list.

[MaskRay]

I am now using ccls :)