Identifier "ImGui" not declared in the current scope

[Woffelson]

Godot version: v4.4.stable.official [4c311cbee]

OS: Linux Mint 21.3

ImGui is not recognized by Godot. When I enable the plugin it also prints this error:

E 0:05:01:693   get_node_or_null: Can't use get_node() with absolute paths from outside the active scene tree.
  <C++ virhe>   Condition "!data.inside_tree && p_path.is_absolute()" is true. Returning: nullptr
  <C++ Lähde>   scene/main/node.cpp:1812 @ get_node_or_null()

[pkdawson]

That sounds like the plugin library (.so) isn't loaded. How did you install imgui-godot? Through the AssetLib is the simplest way.

If you install via AssetLib and it still doesn't work, please post the entire terminal output from the editor, from startup (Godot Engine v4.4....etc) until the error.

[pkdawson]

Looks like it's probably because Mint 21.3 has an older version of glibc than the Ubuntu 24.04 runner that I'm using for the Linux build. I'll see if I can switch to Ubuntu 22.04.

[Woffelson]

It was installed via AssetLib. I guess I could upgrade to Mint 22 if that's the issue. Here is the output with replaced project path:

ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://ai/ai.gd:0)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://players/players.gd:0)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://locations/location.gd:0)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://world/hex/hex.gd:0)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://world/hex_outline/hex_outline.gd:0)
ERROR: Failed to load script "res://world/hex_outline/hex_outline.gd" with error "Parse error".
   at: load (modules/gdscript/gdscript.cpp:3022)
ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://ai/ai.gd:0)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://ai/ai.gd:0)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
ERROR: Error loading extension: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: load_extensions (core/extension/gdextension_manager.cpp:291)
Godot Engine v4.4.stable.official.4c311cbee - https://godotengine.org
Vulkan 1.3.280 - Forward+ - Using Device #0: NVIDIA - NVIDIA GeForce GTX 1060 6GB

ERROR: Can't open dynamic library: [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [PROJECT PATH]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so).
   at: open_dynamic_library (drivers/unix/os_unix.cpp:896)
ERROR: Can't open GDExtension dynamic library: 'res://addons/imgui-godot/imgui-godot-native.gdextension'.
   at: open_library (core/extension/gdextension.cpp:702)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)
SCRIPT ERROR: Compile Error: Failed to compile depended scripts.
          at: GDScript::reload (res://ai/ai.gd:0)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:24)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:25)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:26)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:27)
SCRIPT ERROR: Parse Error: Identifier "ImgUi" not declared in the current scope.
          at: GDScript::reload (res://ai/player_actions/build_orbital_action.gd:28)

[krejov100]

I also see this issue when I try using imgui in gdscript, but I am using windows.
It might be relevant, so should mention, I also happen to be using the .net version of godot.
and to be clear Imgui works in .net code, but not the gd scripts in the same project.

[SkaveRat]

Managed to fix the c# part of the extension by manually compiling cimgui like here

This makes the extension actually run for me. The only problem now is, that the gdscript part is still throwing an error in the editor:

Can't open dynamic library: [project]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [project]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so). But that doesn't seem to cause any actual issues for me, as I only use the extension with c#

[ynot01]

Can't open dynamic library: [project]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so. Error: /lib/x86_64-linux-gnu/libm.so.6: version `GLIBC_2.38' not found (required by [project]/addons/imgui-godot/bin/libimgui-godot-native.linux.debug.x86_64.so). But that doesn't seem to cause any actual issues for me, as I only use the extension with c#

GLIBC 2.38 is included in Ubuntu 24.04 (Noble Numbat), prior versions like 22.04 and 20.04 do not include it, so it will not run. Building in 20.04 should resolve this- GLIBC versions are backwards compatible so 22.04 and 24.04 will be able to run it still.