Unity 2022.3 compile errors on beta 9.6.9-beta.5 / commit 37ef016

[JMartinezRuiz]

Summary

Installing com.coplaydev.unity-mcp from the moving #beta branch currently resolves to commit 37ef0160663d7cee0fe60e1321075e51f9a19e52 / package version 9.6.9-beta.5.

In Unity 2022.3.4f1, that package fails to compile before the MCP server can be used. This looks like a regression introduced by PR #1097 and then published as 9.6.9-beta.5 by PR #1099.

Environment

• Unity: 2022.3.4f1
• OS: Windows
• Package source:

"com.coplaydev.unity-mcp": "https://github.com/CoplayDev/unity-mcp.git?path=/MCPForUnity#beta"

• Resolved package:
  • commit: 37ef0160663d7cee0fe60e1321075e51f9a19e52
  • package version: 9.6.9-beta.5

Actual result

Unity enters Safe Mode / compile fails with these errors:

Library\PackageCache\com.coplaydev.unity-mcp@37ef016066\Runtime\Helpers\UnityFindObjectsCompat.cs(66,20): error CS0103: The name 'LegacyFindObjectsOfType' does not exist in the current context

Library\PackageCache\com.coplaydev.unity-mcp@37ef016066\Runtime\Helpers\ScreenshotUtility.cs(255,28): error CS0103: The name 'CaptureFromCameraToAssetsFolder' does not exist in the current context

Library\PackageCache\com.coplaydev.unity-mcp@37ef016066\Runtime\Helpers\ScreenshotUtility.cs(260,46): error CS7036: There is no argument given that corresponds to the required formal parameter 'folderOverride' of 'ScreenshotUtility.PrepareCaptureResult(string, int, bool, string, bool)'

Library\PackageCache\com.coplaydev.unity-mcp@37ef016066\Runtime\Helpers\ScreenshotUtility.cs(273,32): error CS0103: The name 'CaptureFromCameraToAssetsFolder' does not exist in the current context

Library\PackageCache\com.coplaydev.unity-mcp@37ef016066\Runtime\Helpers\ScreenshotUtility.cs(311,45): error CS1061: 'ScreenshotCaptureResult' does not contain a definition for 'AssetsRelativePath' and no accessible extension method 'AssetsRelativePath' accepting a first argument of type 'ScreenshotCaptureResult' could be found

Expected result

The Unity package should compile cleanly on Unity 2022.3.x, or the package metadata should exclude unsupported Unity versions.

Suspected cause

There appear to be two separate regressions.

1. UnityFindObjectsCompat.cs preprocessor mismatch

For Unity 2022.3.x, FindAll(Type type, bool includeInactive) falls into the legacy fallback branch because the new include-inactive overload is gated behind UNITY_2023_1_OR_NEWER.

However, the legacy reflection helpers are compiled only when !UNITY_2022_3_OR_NEWER, so Unity 2022.3.x calls LegacyFindObjectsOfType(...) while that helper is excluded by preprocessor defines.

Unity 2022.3 documents the overload:

Object.FindObjectsByType(Type type, FindObjectsInactive findObjectsInactive, FindObjectsSortMode sortMode)

So the guard probably needs to include Unity 2022.3.x, or the legacy helper must remain compiled for the fallback branch.

Possible fix:

-#elif UNITY_2023_1_OR_NEWER
+#elif UNITY_2022_3_OR_NEWER
     return UObject.FindObjectsByType(type,
         includeInactive ? UnityEngine.FindObjectsInactive.Include : UnityEngine.FindObjectsInactive.Exclude,
         UnityEngine.FindObjectsSortMode.None);

2. ScreenshotUtility.cs incomplete rename/refactor

The beta code seems to have renamed:

• AssetsRelativePath -> ProjectRelativePath
• CaptureFromCameraToAssetsFolder -> CaptureFromCameraToProjectFolder
• CaptureToAssetsFolder -> CaptureToProjectFolder
• PrepareCaptureResult(...) now requires folderOverride

But CaptureComposited(...) still references old names/signatures:

• CaptureFromCameraToAssetsFolder(...)
• PrepareCaptureResult(fileName, superSize, ensureUniqueFileName, isAsync: false)
• result.AssetsRelativePath

The same stale Assets* API names also appear in Editor/Tools/ManageScene.cs, although the Runtime assembly fails first, so Unity reports the Runtime errors before possible Editor assembly errors.

Possible fixes:

• Update remaining old call sites to the new Project* names and pass folderOverride: null where needed.
• Or keep backward-compatible wrapper members temporarily:

public string AssetsRelativePath => ProjectRelativePath;

public static ScreenshotCaptureResult CaptureFromCameraToAssetsFolder(
    Camera camera,
    string fileName = null,
    int superSize = 1,
    bool ensureUniqueFileName = true,
    bool includeImage = false,
    int maxResolution = 0)
{
    return CaptureFromCameraToProjectFolder(
        camera, fileName, superSize, ensureUniqueFileName, includeImage, maxResolution);
}

Workaround

Pinning the Unity package to a fixed stable release avoids the broken beta commit:

"com.coplaydev.unity-mcp": "https://github.com/CoplayDev/unity-mcp.git?path=/MCPForUnity#v9.6.8"

This is only a workaround; it avoids 37ef016... / 9.6.9-beta.5 rather than fixing the beta branch.

Related PRs / commits

• PR Update0503 #1097: Update0503 #1097
• PR chore: update Unity package to beta version 9.6.9-beta.5 #1099: chore: update Unity package to beta version 9.6.9-beta.5 #1099
• Failing beta commit: 37ef016

[Ferrarie]

same unity editor version, same error. I have to discard package version to solve those compile errors

[dsarno]

Thanks, working on this.

[dsarno]

Fixed, thanks for flagging.