First of all its not his java or computer causing the issue...just cause it says java in the error doesn't mean updating java will fix it -.-".
If you updated to the 3.1.3 dev build which im assuming you did, the way I fixed this error was by deleting the advanced machines mod for IC2 on the server and client (however I downgraded my server back to 3.1.2 because I want this mod) so if you don't want to delete the mod or there is another issue besides that just wait until the recommended build of tekkit 3.1.3 is released (News post says a week or so)
19:23:33 [SEVERE] java.lang.RuntimeException: java.lang.NoSuchMethodException:
c2.platform.NetworkManager.initiateTileEntityEvent(net.minecraft.src.TileEntity
int, boolean)
19:23:33 [SEVERE] at ic2.api.NetworkHelper.initiateTileEntityEvent(Networ
Helper.java:62)
19:23:33 [SEVERE] at ic2.advancedmachines.TileEntityAdvancedMachine.q_(Ti
eEntityAdvancedMachine.java:130)
19:23:33 [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1
89)
19:23:33 [SEVERE] at net.minecraft.server.MinecraftServer.w(MinecraftServ
r.java:559)
19:23:33 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftSe
ver.java:457)
19:23:33 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(Sou
ceFile:492)
19:23:33 [SEVERE] Caused by: java.lang.NoSuchMethodException: ic2.platform.Netw
rkManager.initiateTileEntityEvent(net.minecraft.src.TileEntity, int, boolean)
19:23:33 [SEVERE] at java.lang.Class.getMethod(Unknown Source)
19:23:33 [SEVERE] at ic2.api.NetworkHelper.initiateTileEntityEvent(Networ
Helper.java:49)
19:23:33 [SEVERE] ... 5 more
19:23:33 [SEVERE] Unexpected exception
java.lang.RuntimeException: java.lang.NoSuchMethodException: ic2.platform.Netwo
kManager.initiateTileEntityEvent(net.minecraft.src.TileEntity, int, boolean)
at ic2.api.NetworkHelper.initiateTileEntityEvent(NetworkHelper.java:62)
at ic2.advancedmachines.TileEntityAdvancedMachine.q_(TileEntityAdvanced
achine.java:130)
at net.minecraft.server.World.tickEntities(World.java:1189)
at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:559)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:457)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)
Caused by: java.lang.NoSuchMethodException: ic2.platform.NetworkManager.initiat
TileEntityEvent(net.minecraft.src.TileEntity, int, boolean)
at java.lang.Class.getMethod(Unknown Source)
at ic2.api.NetworkHelper.initiateTileEntityEvent(NetworkHelper.java:49)
... 5 more
>
Any Ideas?? Thanks
If you updated to the 3.1.3 dev build which im assuming you did, the way I fixed this error was by deleting the advanced machines mod for IC2 on the server and client (however I downgraded my server back to 3.1.2 because I want this mod) so if you don't want to delete the mod or there is another issue besides that just wait until the recommended build of tekkit 3.1.3 is released (News post says a week or so)