SEVERE: Add-on nxt.addons.JPLSnapshot not found

I am syncing to the blockchain but in terminal I get "nxt.addons.JPLSnapshot" not found.
"SEVERE: Add-on nxt.addons.JPLSnapshot not found" - in linux terminal...

This is at the end of the .properties file:
(I find it odd because previously this was not a problem and I had made my genesis accounts very easily... synced and forged... what's causing it not to load? I wonder...

NRS version.

nxt.version=1.12.3

nxt.apiServerHost=0.0.0.0
nxt.myAddress=169.0.114.44
nxt.allowedBotHosts=*
nxt.allowedUserHosts=127.0.0.1; localhost; 0:0:0:0:0:0:0:1;
nxt.addOns=nxt.addons.JPLSnapshot