Hello! I just used the app on 10 tablets, in 3 of them, the sync worked just fine.
The other ones can't sync, the error message is "RPC is connected but the adition response fails".

There's other surveys on the app that the sync worked.

Does anyone here got the same error?

There is a subforum here specifically for Offline surveys. I will move this post there.

Hi, this happens when you change your survey structure on LimeSurvey without updating the apps... The app then try to sync a response with old format that is rejected by LimeSurvey...

Always make sure to:
1- Sync all responses on devices
2- refresh survey on all devices
Before changing a survey on LimeSurvey after being added to OfflineSurves