Adding projects does not work with project.el

[gbThreepwood]

When using project.el as opposed to projectile, adding new projects does not work. I get the following backtrace:

Debugger entered--Lisp error: (wrong-type-argument arrayp nil)
  treemacs-add-project-to-workspace("/home/eirik/git/latex/emacs_testing/")
  funcall-interactively(treemacs-add-project-to-workspace "/home/eirik/git/latex/emacs_testing/")
  call-interactively(treemacs-add-project-to-workspace nil nil)
  command-execute(treemacs-add-project-to-workspace)

Installed treemacs version has the following git hash: 529876d

The following question could be related: https://emacs.stackexchange.com/questions/71465/wrong-type-argument-adding-projects-to-treemacs

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[Alexander-Miller]

I only use project.el myself and have no such problems - how do you know it's related? I don't think interactively adding projects even looks at your project implementation.

The error you see likely indicates that there is something wrong with treemacs' internal state. Do you see the same problem when you kill the treemacs buffer with Q and then re-open it?

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