What's this error, world2.err log file

[letanduy]

2014-04-07 00:36:35 ubuntu gamed: err : historyld stage1 still modify val1850 at new stage0 [adv:0ret:0]
2014-04-07 00:36:35 ubuntu gamed: err : historyld stage1 still modify val1850 at new stage0 [adv:0ret:0]
2014-04-07 00:37:14 ubuntu gamed: err : historyld stage1 still modify val1900 at new stage0 [adv:0ret:0]
2014-04-07 00:37:14 ubuntu gamed: err : historyld stage1 still modify val1900 at new stage0 [adv:0ret:0]
2014-04-07 00:37:14 ubuntu gamed: err : historyld stage1 still modify val1900 at new stage0 [adv:0ret:0]
2014-04-07 00:37:14 ubuntu gamed: err : historyld stage1 still

Whats this?