soagent hogging RAM

I have a early 2014 MacBook Air and it quite often starts using most of its 8GB RAM, when I check activity monitor I see soagent is one of the main culprits, i checked in console and this is the main error relating to it,

"warning: dynamic accessors failed to find @property implementation for 'uniqueId' for entity ABCDAddressBookSource while resolving selector 'uniqueId' on class 'ABCDAddressBookSource'. Did you remember to declare it @dynamic or @synthesized in the @implementation ?"

Anyone have any ideas?