So following the instructions on the Localisation guide I was at the "Window/Asset Management/Addressable Assets/Groups by clicking Build/New Build/Default Build Script" part and I got this error:
ArgumentException: Asset ‘Library/unity default resources’ is not a valid Asset or Scene.
UnityEditor.Build.Pipeline.BundleBuildContent…ctor (System.Collections.Generic.IEnumerable`1[T] bundleBuilds) (at Library/PackageCache/com.unity.scriptablebuildpipeline@1.15.1/Editor/Shared/BuildContent.cs:147)
UnityEditor.AddressableAssets.Build.DataBuilders.BuildScriptPackedMode.DoBuild[TResult] (UnityEditor.AddressableAssets.Build.AddressablesDataBuilderInput builderInput, UnityEditor.AddressableAssets.Build.DataBuilders.AddressableAssetsBuildContext aaContext) (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/Build/DataBuilders/BuildScriptPackedMode.cs:177)
UnityEditor.AddressableAssets.Build.DataBuilders.BuildScriptPackedMode.BuildDataImplementation[TResult] (UnityEditor.AddressableAssets.Build.AddressablesDataBuilderInput builderInput) (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/Build/DataBuilders/BuildScriptPackedMode.cs:77)
UnityEditor.AddressableAssets.Build.DataBuilders.BuildScriptBase.BuildData[TResult] (UnityEditor.AddressableAssets.Build.AddressablesDataBuilderInput builderInput) (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/Build/DataBuilders/BuildScriptBase.cs:84)
UnityEditor.AddressableAssets.Settings.AddressableAssetSettings.BuildPlayerContentImpl () (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/Settings/AddressableAssetSettings.cs:1909)
UnityEditor.AddressableAssets.Settings.AddressableAssetSettings.BuildPlayerContent () (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/Settings/AddressableAssetSettings.cs:1891)
UnityEditor.AddressableAssets.GUI.AddressableAssetsSettingsGroupEditor.OnBuildPlayerData () (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/GUI/AddressableAssetsSettingsGroupEditor.cs:280)
UnityEditor.AddressableAssets.GUI.AddressableAssetsSettingsGroupEditor.OnBuildScript (System.Object context) (at Library/PackageCache/com.unity.addressables@1.16.15/Editor/GUI/AddressableAssetsSettingsGroupEditor.cs:275)
UnityEditor.GenericMenu.CatchMenu (System.Object userData, System.String[ ] options, System.Int32 selected) (at <7d90b28560b644ce87b8263efcc36eed>:0)
Any thoughts?