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Fixed in 2020.1

Fixed in 2018.4, 2019.3



Found in





Issue ID




Building asset bundles when build path doesn't exist causes a failed assertion on "pluginAppendices.size() <= 1"

Asset Bundles


How to reproduce:
1. Open the attached project
2. Make sure Project/AssetBundles directory doesn't exist
3. Window > AssetBundle Browser >> Build
4. Select any Build Target that is supported
5. Press Build

Actual result: Failed assertion is thrown.
Expected result: No failed assertion is thrown.

Reproducible with: 2020.1.0a17, 2019.3.0f3, 2019.2.16f1, 2018.4.14f1.
Regression introduced in: 2020.1.0a5, 2019.3.0b7, 2019.2.13f1, 2018.4.13f1.
Not reproducible with: 2020.1.0a4, 2019.3.0b6, 2019.2.12f1, 2018.4.12f1.

- The error appears if the asset bundle build path doesn't exist.

  1. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0a19

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