The Problem
The other day, when I started Emacs as usual, the following message appeared in the minibuffer:
Project <Project Name> at <Project Path> cannot be read.
Emacs then became a piece of software that simply displayed a white screen.
I had recently changed the path of this project, so I suspected that might be the cause.
I tried modifying/deleting the project path in projectile-known-projects-file, but the situation didn’t improve.
I also tried commands like doom sync and doom upgrade, but none of these resolved the issue.
The Solution
After some trial and error, I discovered that the culprit was, surprisingly, treemacs.
Treemacs saves session information in treemacs-persist-file (usually user-emacs-directory/.cache/treemacs-persist).
As the name suggests it was treemacs_persist persisting.
That was casue of this problem.
Therefore, you can resolve the problem by running
rm ~/.config/emacs/.cache/treemacs-persist # path may vary depending on your environment
I had Treemacs installed but wasn’t really using it, so I removed it from my init file.
Thank you for reading.
Reference
Project .emacs.d at User/x.emacs.d cannot be read. · Issue #586 · Alexander-Miller/treemacs