The first word translates to “re-grant” which I assume is “restore”. The App Store believes the user never purchased the app.
You are correct with your translation.
The reason for this error message is, that the user(s) was signed in with a different Apple ID at the time of downloading your App via the Appstore, from the time at which they tried to restore their subscription.
The user must uninstall the app and then make sure he/she is signed into his itunes account with which he purchased a subscription within your app. Redownload the app, restore purchases -> No more errors.