FYI, got this when a server with an update. Subsequent join was fine, so just posting this here as a heads up.
Don't know how to instantiate item of class 'ItemCorpseCompass' did you forget to register a mapping?
Small snippet of the stack trace:
14:42:11 [Client Notification] Received server assets
14:42:12 [Client Fatal] Game Version: v1.16.4-rc.2 (Unstable)
Loaded Mods: animalcages@2.0.6, fancydoors@1.1.0, itemlights@1.0.2, meteoricexpansion@1.1.1, moreclasses@1.2.3, moreroads@1.4.3, necessaries@1.1.1, primitivesurvival@2.8.0, shinglesandthethings@1.0.1, rope-bridges@1.1.0, spyglass@0.4.5, stacks@1.0.4, tradeomat@1.6.0, viescraftmachines@1.6.0, game@1.16.4-rc.2, alchemy@1.5.9, carrycapacity@0.6.4, dsdebarkedlogs@1.0.4, fancyplanters@1.0.2, lichen@1.6.1, medievalexpansion@3.7.1, morepiles@1.2.0, petai@1.3.5, pei@1.2.1, peifm@1.0.1, playercorpse@1.3.1, prospectorinfo@3.1.2, tprunes@1.0.3, usefulstuff@2.3.1, creative@1.16.4-rc.2, survival@1.16.4-rc.2, wildfarming@1.2.6, workbenchexpansion@1.4.1, xlib@0.6.8, xrowboat@0.0.3, bricklayers@0.8.2, cobexclusives@1.1.7, wildcraft@1.1.5, xskills@0.6.8
2/18/2022 2:42:12 PM: Critical error occurred
System.Exception: Don't know how to instantiate item of class 'ItemCorpseCompass' did you forget to register a mapping?
at Vintagestory.Common.ClassRegistry.CreateItem (System.String itemClass) [0x0001e] in <3aa4f8920680447d8df075ec4b7a22be>:0
at Vintagestory.Common.ItemTypeNet.ReadItemTypePacket (_1JWH9Rmp8oPzS6mKCpgHIl6zlgI packet, Vintagestory.API.Common.IWorldAccessor world, Vintagestory.Common.ClassRegistry registry) [0x00000] in <3aa4f8920680447d8df075ec4b7a22be>:0
at Vintagestory.Client.NoObf.GeneralPacketHandler.HandleServerAssetsStep1 () [0x000cb] in <3aa4f8920680447d8df075ec4b7a22be>:0
at Vintagestory.Client.NoObf.GeneralPacketHandler+<>c.<HandleServerAssets>b__21_0 () [0x00000] in <3aa4f8920680447d8df075ec4b7a22be>:0
at Vintagestory.Client.NoObf.ClientMain.ExecuteMainThreadTasks (System.Single deltaTime) [0x00028] in <3aa4f8920680447d8df075ec4b7a22be>:0
at _fxfI2UE0ayN90kkW3TlPfqCqByE._9cfcId0IFdBkNhMH5h3zKScp7JtA (System.Single ) [0x00400] in <3aa4f8920680447d8df075ec4b7a22be>:0
at _bjnBWlJotnHiR69aw1flHb4F023._U6WbyQ4am861wMSz04lHr6bdWYyA (System.Single ) [0x001c0] in <3aa4f8920680447d8df075ec4b7a22be>:0
at _bjnBWlJotnHiR69aw1flHb4F023._PeYLgU97COZFmBgbuLznjIwJUOS (System.Single ) [0x000cc] in <3aa4f8920680447d8df075ec4b7a22be>:0
at Vintagestory.Client.NoObf.ClientPlatformWindows.window_RenderFrame (System.Object sender, OpenTK.FrameEventArgs e)