´[Help]Aion-Core 4.7.5

[Pandora243]

2016-11-21 01:44:00,540 Critical Error - Thread: main terminated abnormaly: com.aionemu.commons.services.cron.CronServiceException: Failed to start job
com.aionemu.commons.services.cron.CronServiceException: Failed to start job
at com.aionemu.commons.services.CronService.schedule(CronService.java:117) ~[ac-commons-1.3.jar:na]
at com.aionemu.commons.services.CronService.schedule(CronService.java:98) ~[ac-commons-1.3.jar:na]
at com.aionemu.gameserver.services.LimitedItemTradeService.start(Unknown Source) ~[AC-Game.jar:na]
at com.aionemu.gameserver.GameServer.main(Unknown Source) ~[AC-Game.jar:na]
Caused by: org.quartz.ObjectAlreadyExistsException: Unable to store Job : 'DEFAULT.JobKey:Started at ms1479699840509; ns116577085573864', because one already exists with this identification.
at org.quartz.simpl.RAMJobStore.storeJob(RAMJobStore.java:277) ~[quartz-2.1.7.jar:na]
at org.quartz.simpl.RAMJobStore.storeJobAndTrigger(RAMJobStore.java:249) ~[quartz-2.1.7.jar:na]
at org.quartz.core.QuartzScheduler.scheduleJob(QuartzScheduler.java:840) ~[quartz-2.1.7.jar:na]
at org.quartz.impl.StdScheduler.scheduleJob(StdScheduler.java:250) ~[quartz-2.1.7.jar:na]
at com.aionemu.commons.services.CronService.schedule(CronService.java:115) ~[ac-commons-1.3.jar:na]
... 3 common frames omitted

[MentaL]

[TyreXo]

Before of that worked? I had something like your problem, I was changing some files with another files and this error appeared, but I had a backup of those files and put again the old ones and worked.