the following issue occurs when using this mod

FML/]: Detected ongoing potential memory leak. 600 packets have leaked. Top offenders
[17:57:32] [Server thread/ERROR] [FML/]: TravellersGear : 600
[17:57:38] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 700 packets have leaked. Top offenders
[17:57:38] [Server thread/ERROR] [FML/]: TravellersGear : 700
[17:57:49] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 800 packets have leaked. Top offenders
[17:57:49] [Server thread/ERROR] [FML/]: TravellersGear : 800
[17:57:54] [Server thread/DEBUG] [FML/]: Gathering id map for writing to world save world
[17:57:58] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 900 packets have leaked. Top offenders
[17:57:58] [Server thread/ERROR] [FML/]: TravellersGear : 900
[17:58:08] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1000 packets have leaked. Top offenders
[17:58:08] [Server thread/ERROR] [FML/]: TravellersGear : 1000
[17:58:11] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1100 packets have leaked. Top offenders
[17:58:11] [Server thread/ERROR] [FML/]: TravellersGear : 1100
[17:58:14] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1200 packets have leaked. Top offenders
[17:58:14] [Server thread/ERROR] [FML/]: TravellersGear : 1200
[17:58:19] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1300 packets have leaked. Top offenders
[17:58:19] [Server thread/ERROR] [FML/]: TravellersGear : 1300
[17:58:22] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1400 packets have leaked. Top offenders
[17:58:22] [Server thread/ERROR] [FML/]: TravellersGear : 1400
[17:58:25] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1500 packets have leaked. Top offenders
[17:58:25] [Server thread/ERROR] [FML/]: TravellersGear : 1500
[17:58:28] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1600 packets have leaked. Top offenders
[17:58:28] [Server thread/ERROR] [FML/]: TravellersGear : 1600
[17:58:31] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1700 packets have leaked. Top offenders
[17:58:31] [Server thread/ERROR] [FML/]: TravellersGear : 1700
[17:58:34] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1800 packets have leaked. Top offenders
[17:58:34] [Server thread/ERROR] [FML/]: TravellersGear : 1800
[17:58:38] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 1900 packets have leaked. Top offenders
[17:58:38] [Server thread/ERROR] [FML/]: TravellersGear : 1900
[17:58:39] [Server thread/DEBUG] [FML/]: Gathering id map for writing to world save world
[17:58:42] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2000 packets have leaked. Top offenders
[17:58:42] [Server thread/ERROR] [FML/]: TravellersGear : 2000
[17:59:11] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2100 packets have leaked. Top offenders
[17:59:11] [Server thread/ERROR] [FML/]: TravellersGear : 2100
[17:59:13] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2200 packets have leaked. Top offenders
[17:59:13] [Server thread/ERROR] [FML/]: TravellersGear : 2200
[17:59:15] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2300 packets have leaked. Top offenders
[17:59:15] [Server thread/ERROR] [FML/]: TravellersGear : 2300
[17:59:17] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2400 packets have leaked. Top offenders
[17:59:17] [Server thread/ERROR] [FML/]: TravellersGear : 2400
[17:59:24] [Server thread/DEBUG] [FML/]: Gathering id map for writing to world save world
[17:59:31] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2500 packets have leaked. Top offenders
[17:59:31] [Server thread/ERROR] [FML/]: TravellersGear : 2500
[17:59:35] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2600 packets have leaked. Top offenders
[17:59:35] [Server thread/ERROR] [FML/]: TravellersGear : 2600
[17:59:38] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2700 packets have leaked. Top offenders
[17:59:38] [Server thread/ERROR] [FML/]: TravellersGear : 2700
[17:59:42] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2800 packets have leaked. Top offenders
[17:59:42] [Server thread/ERROR] [FML/]: TravellersGear : 2800
[17:59:45] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 2900 packets have leaked. Top offenders
[17:59:45] [Server thread/ERROR] [FML/]: TravellersGear : 2900
[17:59:48] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3000 packets have leaked. Top offenders
[17:59:48] [Server thread/ERROR] [FML/]: TravellersGear : 3000
[17:59:52] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3100 packets have leaked. Top offenders
[17:59:52] [Server thread/ERROR] [FML/]: TravellersGear : 3100
[18:00:09] [Server thread/DEBUG] [FML/]: Gathering id map for writing to world save world
[18:00:13] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3200 packets have leaked. Top offenders
[18:00:13] [Server thread/ERROR] [FML/]: TravellersGear : 3200
[18:00:33] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3300 packets have leaked. Top offenders
[18:00:33] [Server thread/ERROR] [FML/]: TravellersGear : 3300
[18:00:54] [Server thread/DEBUG] [FML/]: Gathering id map for writing to world save world
[18:00:54] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3400 packets have leaked. Top offenders
[18:00:54] [Server thread/ERROR] [FML/]: TravellersGear : 3400
[18:01:09] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3500 packets have leaked. Top offenders
[18:01:09] [Server thread/ERROR] [FML/]: TravellersGear : 3500
[18:01:13] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3600 packets have leaked. Top offenders
[18:01:13] [Server thread/ERROR] [FML/]: TravellersGear : 3600
[18:01:32] [Server thread/ERROR] [FML/]: Detected ongoing potential memory leak. 3700 packets have leaked. Top offenders
[18:01:32] [Server thread/ERROR] [FML/]: TravellersGear : 3700

Cannot reproduce. More infos required, like modlist and the are you are in when this happened. This error existed in prior version because of fake players like Bibliocraft Armorstand, but it has been fixed.

updated to the most recent version and still get the error it is with the mechanical titan pack. to be honest i think its from to many mods if i pull a few out just a random it seems to go away

The error existed before when attempting to synchronize data like the titles without realizing that it was a fake player, thus resulting in the leak of packets. If you could find out which mod you removed to make it work, I would be really thankful^^

Took long enough, but: Fixed in version 1.16