TSM error

Trying to open my mailbox, this pops up, then I click TSM_Mailing at the bottom and can't use the mailbox at all until reload.

Date: 07/29/13 00:07:18
Message:  Interface\AddOns\TradeSkillMaster\GUI\GroupTree.lua:336: Usage: <unnamed>:SetFont("font", fontHeight [, flags])
Stack:
[C]: <SetFont>
TSM\GUI\GroupTree.lua:336: <CreateGroupTree>
TSM_Mailing\Modules\Groups.lua:28: <CreateTab>
TSM_Mailing\Modules\MailTab.lua:223: <CreateTabs>
TSM_Mailing\Modules\MailTab.lua:156: <CreateMailTab>
TSM_Mailing\Modules\MailTab.lua:21: <callback>
TSM\Util\Util.lua:284: <Util.lua:272>
Locale: enUS
Addons:
    _Cursor (5.0.0.1)
    _NPCScan (5.0.0.5)
    _NPCScan.Overlay (5.0.0.3)
    ACP (3.4.3)
    Altoholic (r133)
    AutoSafariHat (1.2.1)
    BankStack (v32)
    BuyEmAll (3.1.7)
    Clique (v50200-1.0.4)
    CollectMe (v2.4.3)
    DataStore (r40)
    DungeonHelper (v2.3.5)
    Factionizer (5.03.00.23 13.7.17)
    GatherMate2 (1.26)
    GloriousDrops (0.3)
    IoTWeeklyCheck ()
    IoTRares (1.00)
    Leatrix_Plus (5.3.00)
    LibAuctionScan-1.0 (v1.0.14)
    LightHeaded (354)
    MikScrollingBattleText (5.7.129)
    MogIt (3.1.5)
    MSBTOptions ()
    Omen (v3.1.8)
    Overachiever (0.72)
    PetCaught (1.1)
    PetTracker ()
    PetTracker_Alerts ()
    PetTracker_Journal ()
    PetTracker_Switcher ()
    RaidAchievement (1.127)
    Rarity (r199-release)
    Rarity_Options (r199-release)
    Recount (v5.3.0a release)
    SavedInstances (5.6.8)
    SickOfClickingDailies (v7.0.7-Release)
    SickOfClickingDailies_AltTracking (v7.0.7-Release)
    TitanBag (5.1.21.50300)
    WeakAuras (1.4.7.10)
    WeakAurasModelPaths (1.4.7.10)
    WeakAurasOptions (1.4.7.10)
    +Wowhead_Looter (50005)
    TSM (Dev121)
    TSM_Accounting (Dev121)
    TSM_Additions (Dev121)
    TSM_AuctionDB (Dev121)
    TSM_Auctioning (Dev121)
    TSM_Crafting (Dev121)
    TSM_Destroying (Dev121)
    TSM_ItemTracker (Dev121)
    TSM_Mailing (Dev121)
    TSM_Shopping (Dev121)
    TSM_Warehousing (Dev121)
    TSM_WoWuction (Dev121)
    ElvUI_Config (1.01)
    ElvUI_AddOnSkins (1.32)
    ElvUI (6.2)
    DBM-Core (5.3.5)