Hello physiker123,
I have no direct answer to your problem.
But it would be nice, if you can help me starting with Domoticz.
I also like to install Domoticz on a Synology DS115.

Did you take one of the Jumbotroll packages?
If yes, which one:
DSM 6.0 Domoticz V3.4834 Stable precompiled
DSM 6.0 beta ...