I have installed limesurvey on my local server and make an alias with custom port (port 9443) public avaiable I can see my survey on every browser up and running ok , But on offlinesyrveys app i get this error. I have enable already json-rpc and create a valid ssl certificate , added to my webserver. However i cannot add my survey on the application. Could you help me?

Limeserver edition 5.6.8
latest offlinesyrveys app downloaded via google play store on Android 13 devices
 

I will reply to myself and to give answers to other users.
It was my fault that I only set my web address only on the form eg. www.example.com and not the full address www.example.com/id-of-survey . After that i can use offlinesurveys