Localization : SerializeReference multiple errors on fresh download

Hi all,
I would like to try the Localization package as it might be just what I need for a project. I installed it by adding the dependency in the manifest file with the line

Code (csharp):

1. "com.unity.localization": "0.7.1-preview"

but as soon as it downloads I get the following errors:

Code (csharp):

1.  
2. -----CompilerOutput:-stderr----------
3. -----EndCompilerOutput---------------
4. - Finished compile Library/ScriptAssemblies/Unity.Localization.dll
5. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Metadata\MetadataCollection.cs(64,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
6. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Pseudo\PseudoLocale.cs(56,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
7. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Settings\Database\LocalizedStringDatabase.cs(19,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
8. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\SmartFormatter.cs(19,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
9. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\SmartFormatter.cs(22,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
10. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\SmartFormatter.cs(25,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
11. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\SmartFormatter.cs(28,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
12. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\Extensions\ListFormatter.cs(39,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
13. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Settings\LocalizationSettings.cs(22,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
14. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Settings\LocalizationSettings.cs(30,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
15. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Settings\LocalizationSettings.cs(33,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
16. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Settings\LocalizationSettings.cs(36,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
17. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\Extensions\TemplateFormatter.cs(15,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
18. Library\PackageCache\com.unity.localization@0.7.1-preview\Runtime\Smart Format\Core\Parsing\Parser.cs(20,10): error CS0122: 'SerializeReference' is inaccessible due to its protection level
19.  

I'm using Unity 2019.2

Any pointers?
Thanks!