If you are using older bindings with an updated openHAB (e.g. old JARs in your addons folder) you have to update these with a more recently compiled version.
See: Unit-Support, KNX 2, Karaf 4.1.5 Upgrade and more! - #6 by mhilbush
If you are using older bindings with an updated openHAB (e.g. old JARs in your addons folder) you have to update these with a more recently compiled version.
See: Unit-Support, KNX 2, Karaf 4.1.5 Upgrade and more! - #6 by mhilbush