E21: 'modifiable' is off error when running CopilotChat commands in LazyVim

[JakobEdvardsson]

I'm using LazyVim and CopilotChat.nvim (commit fa8bb09). When I run :CopilotChatCommit or similar commands (e.g. select_prompt()), I get this error:

Error executing vim.schedule lua callback: ...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: The coroutine failed with this message: Vim:E21: Cannot make changes, 'modifiable' is off
stack traceback:
	[C]: in function 'error'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'callback'
	...are/nvim/lazy/CopilotChat.nvim/lua/CopilotChat/utils.lua:681: in function 'returned_function'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:31: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'step'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:48: in function 'execute'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:108: in function 'run'
	...vim/lazy/CopilotChat.nvim/lua/CopilotChat/completion.lua:166: in function ''
	vim/_editor.lua: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

Let me know if you need anything else!

update: does not happen in v4.3.0 only in v4.3.1 v4.4.0

[deathbeam]

Hmm, i cant reproduce this. What if you set auto_insert_mode = false ? (as i see that lazyvim has this on by default)

[deathbeam]

Oh i managed to reproduce it i think

[deathbeam]

Ok it should be fixed now. It was race condition, you cant rly enter and leave insert mode in same vim cycle, and we were bascially creating new window, then entering insert mode, then leaving insert mode. It was also causing some random delayed window opens before that sould also be fixed now so im super happy that this was actually found, thanks for the report!

[JakobEdvardsson]

I'm still getting the same error.

Error executing vim.schedule lua callback: ...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: The coroutine failed with this message: Vim:E21: Cannot make changes, 'modifiable' is off
stack traceback:
	[C]: in function 'error'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'callback'
	...are/nvim/lazy/CopilotChat.nvim/lua/CopilotChat/utils.lua:681: in function 'returned_function'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:31: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'step'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:48: in function 'execute'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:108: in function 'run'
	...vim/lazy/CopilotChat.nvim/lua/CopilotChat/completion.lua:166: in function ''
	vim/_editor.lua: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

[deathbeam]

Are you sure you updated? Do you stay in insert mode while text is being printed to chat? as that was causing the issue basically and triggering completion and completion trying to modify the buffer, and that should be fixed

I'm still getting the same error.

Error executing vim.schedule lua callback: ...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: The coroutine failed with this message: Vim:E21: Cannot make changes, 'modifiable' is off
stack traceback:
	[C]: in function 'error'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'callback'
	...are/nvim/lazy/CopilotChat.nvim/lua/CopilotChat/utils.lua:681: in function 'returned_function'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:31: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'step'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:48: in function 'execute'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:108: in function 'run'
	...vim/lazy/CopilotChat.nvim/lua/CopilotChat/completion.lua:166: in function ''
	vim/_editor.lua: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

[JakobEdvardsson]

Are you sure you updated? Do you stay in insert mode while text is being printed to chat? as that was causing the issue basically and triggering completion and completion trying to modify the buffer, and that should be fixed

I'm still getting the same error.

Error executing vim.schedule lua callback: ...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: The coroutine failed with this message: Vim:E21: Cannot make changes, 'modifiable' is off
stack traceback:
	[C]: in function 'error'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:18: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'callback'
	...are/nvim/lazy/CopilotChat.nvim/lua/CopilotChat/utils.lua:681: in function 'returned_function'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:31: in function 'callback_or_next'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:45: in function 'step'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:48: in function 'execute'
	...share/nvim/lazy/plenary.nvim/lua/plenary/async/async.lua:108: in function 'run'
	...vim/lazy/CopilotChat.nvim/lua/CopilotChat/completion.lua:166: in function ''
	vim/_editor.lua: in function ''
	vim/_editor.lua: in function <vim/_editor.lua:0>

version 4.4.1
tag     v4.4.1
branch  main
commit  f22747a

All that I'm doing is selecting a peace of code: then running CopilotChatFix. Weird that you can't reproduce it. I get it every time, please let me know if there is anything that I can provide to make debugging easier.

For context, I'm on lazyvim with no extra configuration options apart from what lazyvim does: lazyvim

[deathbeam]

Yea, I cant reproduce it its weird. Because the error you are getting is the old one and I was able to reproduce that one. Doing exactly samething as you as well. I also had bad experience with lazyvim actually lying about what version it was one so I dont really trust it, can you try to find CopilotChat/init.lua file and chcek if line 791 is this:

  schedule(function()