Error when opening on NVim 0.6

[Augusto César Dias]

With diagnostics enabled this error happens when I open nvim:

Error detected while processing /Users/augusto/.config/nvim/init.lua:
E5113: Error while calling lua chunk: ...packer/start/nvim-tree.lua/lua/nvim-tree/diagnostics.lua:140: Vim(autocmd):E21
6: No such group or event: DiagnosticChanged * lua require'nvim-tree.diagnostics'.update()
stack traceback:
        [C]: in function 'cmd'
        ...packer/start/nvim-tree.lua/lua/nvim-tree/diagnostics.lua:140: in function 'setup'
        ...m/site/pack/packer/start/nvim-tree.lua/lua/nvim-tree.lua:475: in function 'setup'
        /Users/augusto/.config/nvim/lua/settings.lua:175: in main chunk
        [C]: in function 'require'
        /Users/augusto/.config/nvim/init.lua:10: in main chunk

[gegoune]

Duplicate: #801