ERROR: Index p_type_a = 2712273640 is out of bounds (Variant::VARIANT_MAX = 38)

[ash-hashtag]

just cloned the master repo at this commit
8670305

and tried to compile and run with gdextension example, compiled with no errors, but when opening the project in godot, this error gets thrown and crashes

ERROR: Index p_type_a = 2712273640 is out of bounds (Variant::VARIANT_MAX = 38).
   at: get_ptr_operator_evaluator (core/variant/variant_op.cpp:1051

but older commits work fine, the submodule used in actual gdextension works fine
this commit
https://github.com/godotengine/godot-cpp/tree/862d1f1fdd3201bb1e7bd27e941df2ea8adce3c7

[MGilleronFJ]

Last time I had this error was because I compiled GodotCpp against a different version of the Godot API.
To fix it, I compiled Godot master branch, generated extension_api.json from it, deleted the gen/ folder in GodotCpp, and recompiled it using `custom_api_file="path/to/the/extension_api.json", which worked.

I have no idea why Godot doesn't gracefully handle that, but maybe you should make sure the extension API is exactly matching the Godot version you are using. Are you using Godot 4 beta1 official build? If not, then it will likely fail. The GodotCpp repo is tracking beta1 (see the top of https://github.com/godotengine/godot-cpp/blob/master/godot-headers/extension_api.json).

If everything matches, then perhaps recent changes made it diverge somehow. In which case, compiling Godot to generate extension_api.json and recompile GodotCpp from scratch is your best option (remember to delete gen/). Second option is to stay on an earlier commit.

[ash-hashtag]

I did compile to Godot 4 beta 1, but I'll try with custom api.json

[akien-mga]

4.0 beta 1 is already too old for the master branch of this repo. This repo is always in sync with the master branch of Godot. For beta 1 you need to go back to the commit that says "sync headers with beta 1".

[frankhale]

@ash-hashtag have a look at this related issue. Just need to do what @akien-mga mentioned. The specific commit is listed in the following issue #845