Player wasn't in group # console spam

Code:

layer wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2
Player wasn't in group 2

I have error like this in console, what does it means and how to fix it ? After that spam nobody can connect to server, restart helps
[DOUBLEPOST=1453834983][/DOUBLEPOST]What does it means and how to fix it ?

Code:

Player wasn't in group 23095
Player wasn't in group 22293
Player wasn't in group 22493
Player wasn't in group 22693
Player wasn't in group 22893
Player wasn't in group 23093
Player wasn't in group 22295
Player wasn't in group 22495
Player wasn't in group 22695
Player wasn't in group 22895
Player wasn't in group 23092
Player wasn't in group 22294
Player wasn't in group 22494
Player wasn't in group 22694
Player wasn't in group 22894
Player wasn't in group 22892
Player wasn't in group 22692