Error detected while processing TermResponseAll Autocommands for "osc"

[ir0nh34d]

Steps to reproduce

1. start vim
2. observe the errors listed at the bottom of the screen:
   Error detected while processing TermResponseAll Autocommands for "osc":
   E46: Cannot change read-only variable "v:termrfgresp"
   E46: Cannot change read-only variable "v:termrbgresp"

Expected behaviour

There are no errors

Version of Vim

9.1.1756

Environment

Operating System: Mac
Terminal: iTerm (same happens with MacOs Terminal)
$TERM: xterm-256color
Shell: /bin/zsh

Logs and stack traces

[dpelle]

I get the same errors when starting Vim.

I use the Alacritty 0.15 (1) terminal on macOS-15.6.1.
I ssh to a xubuntu-22.05.5 machine and start Vim on xubuntu and get the same errors.

I bisected and the error started to happen in 9.1.1757. So this is the change that introduces the bug:

commit c077f5e9d82189f5d1ce86068e10540139fec6cb (tag: v9.1.1757)
Author: Foxe Chen <chen.foxe@gmail.com>
Date:   Sun Sep 14 04:38:33 2025 -0400

    patch 9.1.1757: The colorresp plugin causes additional redraws

    Problem:  The colorresp plugin causes additional redraws
              (Linwei, after v9.1.1703)
    Solution: Move the code back into the C core and get rid of the vim
              plugin (Foxe Chen)

    fixes: #18251
    closes: #18279

    Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
    Signed-off-by: Christian Brabandt <cb@256bit.org>

It does not happen with vim --clean but it happens I run run vim with my ~/.vimrc.
I'd need to to minimize the content of my ~/.vimrc, without depending on plugins, to give better reproducible steps.

[chrisbra]

please use make uninstall before doing make install to get rid of the now obsolete colorresp.vim plugin

[chrisbra]

duplicate of #18297

[ir0nh34d]

That fixed it - thanks @chrisbra !