At the stage of connecting to a dedicated server, a Lua error occurs.

[Deleted user]

Branch: develop
Commit: e342f7b

[pac3] addons/pac3/lua/pac3/editor/client/wires.lua:25: attempt to index local 'mtColor' (a nil value)
  1. unknown - addons/pac3/lua/pac3/editor/client/wires.lua:25
   2. include - [C]:-1
    3. unknown - addons/pac3/lua/pac3/editor/client/init.lua:34
     4. include - [C]:-1
      5. unknown - addons/pac3/lua/autorun/pac_editor_init.lua:32

[Deleted user]

Fixed after updating the server, perhaps the cause of the error was this:
Facepunch/garrysmod#2041