Looks like the new BitCore BTX Version 0.15.0.2 update is not working on MacOS High Sierra 10.13.2. I will just roll back to the old version until the update is fully complete.
https://imgur.com/PZTixgmI also got the same error message just a moment ago. Admin please have a look at the Mac wallet please.
I'm on High Sierra 10.13.3