Problem at the start of the application with Persistent Variables

Hi,

After enable smart strings im getting this error every time i click the play button, even when i’m in a scene that has no text translations:

Unknown managed type referenced: [Unity.Localization] UnityEngine.Localization.SmartFormat.Extensions.PersistentVariablesSource

It seems to work everything but this error persist every time i start the application

Do you have the full error message with callstack?
What version of Unity are you using, try updating to the latest patch version.