FTB werewolf20 (v2) [1.4.6] multiplayer problem

[efeefeefe]

Hi, i setup a server with using ftb launcher. i can connect but my friend have these error:

2012-12-29 18:04:00 [SEVERE] [ForgeModLoader] FML has detected item discrepancies
2012-12-29 18:04:00 [SEVERE] [ForgeModLoader] Missing items : {2219=Item 2219, Type extrabiomes.module.fabrica.block.BlockWoodStairs, owned by ExtrabiomesXL, ordinal 1, name null, claimedModId null, 2201=Item 2201, Type extrabiomes.items.ItemCatTail, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null, 2218=Item 2218, Type extrabiomes.module.fabrica.block.BlockWoodStairs, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null, 2223=Item 2223, Type extrabiomes.module.fabrica.block.BlockCustomStairs, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null, 2205=Item 2205, Type extrabiomes.blocks.BlockLeafPile, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null, 2221=Item 2221, Type extrabiomes.module.fabrica.block.BlockCustomStairs, owned by ExtrabiomesXL, ordinal 1, name null, claimedModId null, 2207=Item 2207, Type extrabiomes.items.ItemSapling, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null, 2220=Item 2220, Type extrabiomes.module.fabrica.block.BlockWoodStairs, owned by ExtrabiomesXL, ordinal 2, name null, claimedModId null, 2214=Item 2214, Type extrabiomes.module.cautia.block.BlockQuicksand, owned by ExtrabiomesXL, ordinal 0, name null, claimedModId null}
2012-12-29 18:04:00 [SEVERE] [ForgeModLoader] Mismatched items : {}

this items:

fir wood stairs 2219
cattail 2201
redwood stairs 2218
redcobblestone stairs 2223
leaf pile 2205
red rock brick stairs 2221
2207 saplings (0,1,2,3,4,5,6)
acacia wood stair 2220
quicksand 2214

which mod is the problem? (for disabling) or how can i fix this?

 

[tedyhere]

Does he have the most up to date version of the pack?

 

[efeefeefe]

yes same launcher with same settings. same game with same version etc. everything is same but he is using mac and i am using windows. when he is using windows on his mac, he can join. but playing minecraft in his main OS more important for performance. maybe problem is jar version and exe version of this game (direwolf20 ftb v2) is different.

 

[glasspelican]

mod that's complaining is extrabiomsXL
I doubt that the java version is the problem but you can check the version by running

 java -version

In the terminal ( Mac/Linux) or command prompt (windows)

 

[efeefeefe]

java version "1.6.0_37"
Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-10M3909)
Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode)

we are looking a solutuion but there is no java 7 for snow leopard.