They've changed a bunch of the reputation functions, they're now under C_Reputation. There may be more errors but this is the first that I saw.

3x OrderHallCommander/missionlist.lua:321: attempt to call global 'GetFactionInfoByID' (a nil value)
[string "@OrderHallCommander/missionlist.lua"]:321: in function <OrderHallCommander/missionlist.lua:313>
[string "=(tail call)"]: ?
[string "=[C]"]: ?

Locals:
self =

{
modules = {
}
enabledState = true
defaultModuleLibraries = {
}
baseName = "OrderHallCommander"
orderedModules = {
}
hooks = {
}
defaultModuleState = true
name = "OrderHallCommander_Missionlist"
moduleName = "Missionlist"
}
this = Frame {
Quantity = FontString {
}
itemID = 152959
IconBorder = Texture {
}
IconOverlay = Texture {
}
itemLink = "|cff0070dd|Hitem:152959::::::::60:269:::::::::|h[Argussian Reach Insignia]|h|r"
Icon = Texture {
}
}
tip = GameTooltip {
ATT_AttachComplete = true
ItemTooltip = Frame {
}
AllTheThingsOnTooltipClearedHook = true
BottomOverlay = Texture {
}
NineSlice = Frame {
}
textLeft1Font = "GameTooltipHeaderText"
textRight2Font = "GameTooltipText"
TopOverlay = Texture {
}
TextLeft1 = GameTooltipTextLeft1 {
}
StatusBar = GameTooltipStatusBar {
}
supportsDataRefresh = true
waitingForData = false
AllTheThingsProcessing = "|cff0070dd|Hitem:152959::::::::60:269:::::::::|h[Argussian Reach Insignia]|h|r"
processingInfo = {
}
infoList = {
}
shoppingTooltips = {
}
updateTooltipTimer = 0.110000
TextRight1 = GameTooltipTextRight1 {
}
supportsItemComparison = true
textRight1Font = "GameTooltipHeaderText"
layoutType = "TooltipDefaultLayout"
textLeft2Font = "GameTooltipText"
TextRight2 = GameTooltipTextRight2 {
}
TextLeft2 = GameTooltipTextLeft2 {
}
}
factionID = 2170
(*temporary) = nil
(*temporary) = 2170
(*temporary) = "attempt to call global 'GetFactionInfoByID' (a nil value)"
addon = {
modules = {
}
allEquipments = {
}
hooks = {
}
db = {
}
revision = "a796203"
name = "OrderHallCommander"
defaultModuleState = true
resourceFormat = "Cost: %d"
CfgRel = 147
ProfileOpts = {
}
lastsection = "Release Notes"
help = {
}
prettyversion = "2.3.2 (Revision: a796203)"
version = "2.3.2"
ItemOrder = {
}
enabledState = true
allReputationGain = {
}
DbDefaults = {
}
OptionsTable = {
}
numericversion = 0
_Apply = {
}
baseName = "OrderHallCommander"
MenuLevels = {
}
allArtifactPower = {
}
wowhead_update = 1512310641
CfgDlg = "OrderHallCommander"
defaultModuleLibraries = {
}
die = false
orderedModules = {
}
lastChange = 1206.572000
}
artinfo = "*Artifact shown value is the base value without considering knowledge multiplier"
C = {
silver = {
}
cyan = {
}
grey = {
}
white = {
}
green = {
}
azure = {
}
yellow = {
}
orange = {
}
red = {
}
}
_G = {
ERR_OUT_OF_CHI = "Not enough chi"
DH_HAVOC_CORE_ABILITY_2 = "Strong melee attack that consumes Fury. If it critical strikes, some Fury is refunded."
UNIT_NAMES_COMBATLOG_TOOLTIP = "Color unit names."
AchievementFrameStatsBG = AchievementFrameStatsBG {
}
LE_GAME_ERR_CHAT_RAID_RESTRICTED_TRIAL = 783
SPELL_FAILED_CUSTOM_ERROR_71 = "This partygoer wants to dance with you."
LE_GAME_ERR_PET_SPELL_TARGETS_DEAD = 421
ClassTrialTimerDisplayMixin = {
}
MultiBarLeftButton7 = MultiBarLeftButton7 {
}
MerchantItem5AltCurrencyFrameItem1Text = MerchantItem5AltCurrencyFrameItem1Text {
}
OPTION_SHOW_ACTION_BAR5_TOOLTIP = "Attached to the left side of Action Bar 4 by default"
BINDING_NAME_NAMEPLATES = "Show Enemy Nameplates"
CHAT_HEADER_SUFFIX = ": "
COVENANT_MISSIONS_HEALTH = "Health"
PVPReadyDialogBottomArt = PVPReadyDialogBottomArt {
}
CALENDAR_RAID_RESET_DESCRIPTION = "%1$s resets at %2$s."
VuhDoNewOptionsPanelHotsHotsPanelHotIconsTextureSquaresDiagonalRadioButtonTextureSwatch = VuhDoNewOptionsPanelHotsHotsPanelHotIconsTextureSquaresDiagonalRadioButtonTextureSwatch {
}
AceConfigDialogTooltipTexture20 = AceConfigDialogTooltipTexture20 {
}
CinematicFrameRaidBossEmoteFrame = CinematicFrameRaidBossEmoteFrame {
}
VuhDoNewOptionsColorsModesNormalModePanelIcomingOpacCheckBox = VuhDoNewOptionsColorsModesNormalModePanelIcomingOpacCheckBox {
}
LE_GAME_ERR_ONLY_ONE_QUIVER =

API depreciation:

GetFactionInfoByID was replaced by C_Reputation.GetFactionDataByID