I have the problem, that every time a player gets an (potion-)effect on an Server the game gets a java.lang.IndexOutOfBoundsException.
I tried to reinstall minecraft, as well as the server (also with Thermos instead of KCauldron which had the same problem) but nothing helped.
Google didn't helped me to find an answer and I don't know what to do now to solve the problem.
Logs:
Serverside: fml-log
Serverside latest.log
Mods installed:
P.s.: I know, that the 1.7.10 isn't officially supported anymore but maybe someone knows what to do with this problem.