unity io_error ai_generated true

Failed to load AssetBundle: CRC mismatch. Expected 0xABCD1234, got 0x5678EF90

ID: unity/assetbundle-crc-mismatch

Also available as: JSON · Markdown · 中文
92%Fix Rate
88%Confidence
1Evidence
2023-11-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
Unity 2021.3 active — — —
Unity 2022.3 active — — —
Unity 2023.1 active — — —

Root Cause

AssetBundle file is corrupted or was built with a different version of Unity, causing the CRC check to fail during loading.

generic

中文

AssetBundle文件已损坏或使用不同版本的Unity构建，导致加载时CRC检查失败。

Official Documentation

https://docs.unity3d.com/Manual/AssetBundles-Checksums.html

Workarounds

  1. 95% success Rebuild the AssetBundle from the original assets using the same Unity version that will load it: BuildPipeline.BuildAssetBundles(outputPath, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64); 
    Rebuild the AssetBundle from the original assets using the same Unity version that will load it: BuildPipeline.BuildAssetBundles(outputPath, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
  2. 85% success If the bundle is from a remote server, re-download it to ensure integrity: using UnityWebRequestAssetBundle.GetAssetBundle(url); 
    If the bundle is from a remote server, re-download it to ensure integrity: using UnityWebRequestAssetBundle.GetAssetBundle(url);

中文步骤

  1. 使用将加载它的相同Unity版本从原始资源重建AssetBundle：BuildPipeline.BuildAssetBundles(outputPath, BuildAssetBundleOptions.None, BuildTarget.StandaloneWindows64);
  2. 如果捆绑包来自远程服务器，请重新下载以确保完整性：使用UnityWebRequestAssetBundle.GetAssetBundle(url);

Dead Ends

Common approaches that don't work:

  1. 95% fail

    Manually editing the AssetBundle file to fix the CRC is impractical because the CRC is computed over the entire file and cannot be easily recalculated.

  2. 60% fail

    Disabling CRC checks entirely via AssetBundle.LoadFromFile with crc: 0 ignores corruption and may cause undefined behavior later.