How to reproduce:
1. Open the user attached project (CopyForBugreport.zip)
2. In the Project view go to the "AddressableAssetsData" directory and press on the "AddressableAssetSettings" asset
3. In the Inspector press the "Manage Groups" button
4. In the "Addressables Groups" windows that opens up, open the "Build" dropdown and perform a new build with the default build script

Expected result: the build succeeds
Actual result: the build fails

Reproducible with: 1.0.0, 1.0.3 (2020.3.20f1, 2021.1.26f1, 2021.2.0b15, 2022.1.0a12)
Not reproducible with: 1.0.0-pre.10 (2020.3.20f1)
Couldn't test with: 1.0.3 (2019.4.31f1) (Compilation errors)

Note: Tested and reproducible on both Windows 10 and Ubuntu 20.04