I follow the instructions, but it just launches vanilla minecraft. If i right-click and click "rebuild jar" than it launches the modded version (version and mod count match), but I get this error:
2013-01-29 15:22:52 [INFO] [STDOUT] Connecting to muse.dyndns.tv, 25565
2013-01-29 15:22:55 [INFO] [STDOUT] 0dimID already registered
2013-01-29 15:22:56 [SEVERE] [ForgeModLoader] FML has detected item discrepancies
2013-01-29 15:22:56 [SEVERE] [ForgeModLoader] Missing items : {20260=Item 20260, Type thermalexpansion.core.item.ItemTE, owned by ThermalExpansion, ordinal 0, name null, claimedModId null, 20262=Item 20262, Type thermalexpansion.core.item.ItemTE, owned by ThermalExpansion, ordinal 2, name null, claimedModId null}
2013-01-29 15:22:56 [SEVERE] [ForgeModLoader] Mismatched items : {20257=(Item 20257, Type thermalexpansion.core.item.ItemWrench, owned by ThermalExpansion, ordinal 0, name null, claimedModId null, Item 20257, Type thermalexpansion.core.item.ItemTE, owned by ThermalExpansion, ordinal 1, name null, claimedModId null), 20259=(Item 20259, Type thermalexpansion.energy.item.ItemMJReader, owned by ThermalExpansion|Energy, ordinal 0, name null, claimedModId null, Item 20259, Type mithion.arsmagica.items.ArsMagicaItem, owned by ArsMagica, ordinal 3, name null, claimedModId null), 20261=(Item 20261, Type thermalexpansion.core.item.ItemTE, owned by ThermalExpansion, ordinal 1, name null, claimedModId null, Item 20261, Type thermalexpansion.core.item.ItemTE, owned by ThermalExpansion, ordinal 2, name null, claimedModId null)}
2013-01-29 15:22:57 [INFO] [ForgeModLoader] [THAUMCRAFT] Restoring client configs.