Godot version

4.0 Beta 6

System information

Windows 11

Issue description

When trying to run my project with F5 it halts with Parse Error:
The only information shown is in the console as follows.

E 0:00:02:0469 GDScriptCompiler::_populate_class_members: Condition "!base->is_valid()" is true. Returning: ERR_BUG
<C++ Source> modules\gdscript\gdscript_compiler.cpp:2287 @ GDScriptCompiler::_populate_class_members()

My project is fairly large and runs fine in Beta 5.

in case it helps heres the log when loading up the project:

Godot Engine v4.0.beta6.official.7f8ecffa5 - https://godotengine.org
OpenGL Renderer: NVIDIA GeForce GTX 1080 Ti/PCIe/SSE2
Editing project: C:/SpaceSlog Game/SpaceSlog
Godot Engine v4.0.beta6.official.7f8ecffa5 - https://godotengine.org
Vulkan API 1.2.0 - Using Vulkan Device #0: NVIDIA - NVIDIA GeForce GTX 1080 Ti
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Non-existent native base class.
at: (modules/gdscript/gdscript_analyzer.cpp:4052)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Condition "!base->is_valid()" is true. Returning: ERR_BUG
at: _populate_class_members (modules/gdscript/gdscript_compiler.cpp:2287)
ERROR: Condition "!preset.is_valid()" is true. Continuing.
at: load_config (editor/export/editor_export.cpp:206)
ERROR: Condition "!d.has("handle_modes")" is true. Returning: false
at: _set (scene/resources/animation.cpp:319)

Steps to reproduce

Unfortunately i cannot help much as my project is fairly large. I have tried to narrow the issue down but cannot. Any help with this would be appreciated.

Minimal reproduction project

Please see above.