Hello! I've been working on a jam project aimed at Windows and HTML5 with Spine2D and Godot. Unfortunately, right at the finish line I'm stumbling across a problem exporting builds - while Windows exports perfectly fine, Web always errors out.

I've tried this with the export templates, with both the GDExtension method (the way I built the game) and the custom Spine Godot build for 4.3. Both error out in slightly different ways, yet the spirit remains the same:

GDExtension:

Failed to open res://bin/web/libgdexample.web.template_release.wasm32.nothreads.wasm
editor/export/editor_export_platform.h:182 - Export: Could not write file: "libgdexample.web.template_release.wasm32.nothreads.wasm".

Spine2D custom Godot build

Failed to open res://bin/web/libgdexample.web.template_release.wasm32.nothreads.wasm
D:\a\spine-runtimes\spine-runtimes\spine-godot\godot\editor\export\editor_export_platform.h:182 - Export: Could not write file: "libgdexample.web.template_release.wasm32.nothreads.wasm".

All four .wasm files are on disk at /bin/web, and are not read-only. I've attempted to re-import them multiple times from a fresh download in case they were corrupted, and this does not seem to be the case.

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It seems like you're encountering an issue with exporting your Godot project for the web using Spine2D. The error message indicates that the export process is unable to write the .wasm files, even though they are present on disk. Here are a few steps you can try to resolve this issue:

  1. Check File Permissions: Ensure that the .wasm files in the /bin/web directory have the correct permissions set, allowing them to be read and written by the Godot editor.

  2. Verify Export Template Installation: Make sure that the export templates are correctly installed in the Godot editor. You can do this by going to Editor > Manage export templates... and ensuring that the correct templates for web export are installed.

  3. Rebuild Export Templates: If the issue persists, consider rebuilding the export templates for the web platform. You can follow the instructions provided in the spine-godot Runtime Documentation to compile the export templates from source.

  4. Check Godot Version Compatibility: Ensure that the version of Godot you are using is compatible with the spine-godot runtime and the export templates you have installed.

  5. Review Export Settings: Double-check your export settings in the Godot editor to ensure that all necessary files and configurations are correctly set for web export.

If these steps do not resolve the issue, it may be helpful to try exporting a simpler project to see if the problem is specific to your current project setup.

After some research, I found the culprit:

In bin/spine_godot_extension.gdextension, the web variables for the bin files are incorrect. Unlike every other export, they depend on a non-existent "libgdexample" .wasm file.

Renaming these to libspine_godot instead fixes the problem.