Post your logfile (via pastebin) and someone can assist you with troubleshooting the issue. I was able to help some recently that was playing the game in Alpha 18 only not to realize they were using a save game file from Alpha 20.
There's plenty of brain cells floating around these forums that two will eventually join and might be able to point you in the right direction
awesome, im having a hard time finding the actual log file. The game is heavily modded, I normally do pretty well with finding and fixing the bad codes or whatever in the xmls. But this one seems to just pop up randomly and then spams the console with nonstop nullref errors. and counts up into 6000+ lol. So where can i get you the log file from the next time it does this?
Exception: Item with name 'meleeHandZombieStrong2' not found!
at (wrapper dynamic-method) EntityAlive.DMD<EntityAlive::CopyPropertiesFromEntityClass>(EntityAlive)
at Entity.InitCommon () [0x00029] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityZombie.InitCommon () [0x00000] in <ffc99a688d2b435db53bb46aed82ca49>:0
at Entity.Init (System.Int32 _entityClass) [0x00007] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityAlive.Init (System.Int32 _entityClass) [0x00000] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityEnemy.Init (System.Int32 _entityClass) [0x00000] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityFactory.CreateEntity (EntityCreationData _ecd) [0x004c2] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityFactory.CreateEntity (System.Int32 _et, System.Int32 _id, ItemValue _itemValue, System.Int32 _count, UnityEngine.Vector3 _transformPos, UnityEngine.Vector3 _transformRot, System.Single _lifetime, System.Int32 _playerId, System.String _skinName, System.Int32 _spawnById, System.String _spawnByName) [0x0001b] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityFactory.CreateEntity (System.Int32 _et, System.Int32 _id, UnityEngine.Vector3 _transformPos, UnityEngine.Vector3 _rotation) [0x0000c] in <ffc99a688d2b435db53bb46aed82ca49>:0
at EntityFactory.CreateEntity (System.Int32 _et, UnityEngine.Vector3 _transformPos) [0x00014] in <ffc99a688d2b435db53bb46aed82ca49>:0
at SpawnManagerBiomes.SpawnUpdate (System.String _spawnerName, System.Boolean _isSpawnEnemy, ChunkAreaBiomeSpawnData _chunkBiomeSpawnData) [0x00443] in <ffc99a688d2b435db53bb46aed82ca49>:0
at (wrapper dynamic-method) SpawnManagerBiomes.DMD<SpawnManagerBiomes::Update>(SpawnManagerBiomes,string,bool,object)
at World.OnUpdateTick (System.Single _partialTicks, System.ArraySegment`1[T] _activeChunks) [0x001e6] in <ffc99a688d2b435db53bb46aed82ca49>:0
at GameManager.UpdateTick () [0x00073] in <ffc99a688d2b435db53bb46aed82ca49>:0
at GameManager.gmUpdate () [0x00305] in <ffc99a688d2b435db53bb46aed82ca49>:0
at GameManager.Update () [0x00000] in <ffc99a688d2b435db53bb46aed82ca49>:0
NullReferenceException: Object reference not set to an instance of an object
at Inventory.get_holdingItemData () [0x00038] in <ffc99a688d2b435db53bb46aed82ca49>:0
at (wrapper dynamic-method) EntityAlive.DMD<EntityAlive::Update>(EntityAlive)
this is the error, i found it in the log file. I believe it will be linked to the Mod i have installed for shortening the zombie reach.