Error 404 Generic Exeption

Hello, I have the issue with sending a finalized form to server from 1 of the tablets. Besides from the other tablets it is working, can you provide some help with this ?

Also sending a photo of the error when trying to send forms to server. Not sure, maybe it is the problem with exact form or something else…

Is this a problem from the server side?

Welcome to the community, @Traktirshchik! Could you also let us know the server you are using? Are you one a self-hosted server?