When loading a previous save, the retractable landing gear is gone. I've tested various things: locking/unlocking, extended/retracted, so far it happens consistently every time. I REALLY like this mod, but I'm out of ideas and sick of having to replace them every single time I load a save.

@Doomstrike53, please upload your world. For now i have no idea why that happend.

Well I seem to have found the problem, and I don't know why I didn't think to remove mods and test for incompatibilities. I removed the Configurable Max Ship Speed mod and it worked like a charm.
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=599536562
It sucks though because I really like that mod.

When the gears retract, the hitbox doesn't update, it doesn't move with the gear, wich kinda is a pain. You die when flying at great speed into the hitbox of a retracted gear xD maybe something to look into?

It is with all the gears btw, 1x1, 3x1, small and large

@Doomstrike53, thx, i was able to reproduce it, i asked the Modauthor for help
@BSteurful, its right and a known issue, i tried now to make it more clear in the description

@Takeshi : I suggest checking the log files.
I don't

2017-08-24 20:13:39.931 - Thread: 1 -> ERROR while adding cube LandingGear_3x2x1_retracting: System.NullReferenceException: Object reference not set to an instance of an object.
at VRage.Game.SessionComponents.MyVisualScriptManagerSessionComponent.GetObjectBuilder()
at Sandbox.Game.World.MySession.SaveSessionComponentObjectBuilders(MyObjectBuilder_Checkpoint checkpoint)
at Sandbox.Game.World.MySession.GetCheckpoint(String saveName)
at AnimaScript.Anima.Init(MyEntity entity, String modName, String altModName)
at landinggearanimation.retractablelandinggear.BlockInit()
at landinggearanimation.retractablelandinggear.Init(MyObjectBuilder_EntityBase objectBuilder)
at VRage.Game.Entity.MyEntity.Init(MyObjectBuilder_EntityBase objectBuilder)
at Sandbox.Game.Entities.MyCubeBlock.Init(MyObjectBuilder_CubeBlock builder, MyCubeGrid cubeGrid)
at Sandbox.Game.Entities.Cube.MyTerminalBlock.Init(MyObjectBuilder_CubeBlock objectBuilder, MyCubeGrid cubeGrid)
at Sandbox.Game.Entities.Cube.MyFunctionalBlock.Init(MyObjectBuilder_CubeBlock objectBuilder, MyCubeGrid cubeGrid)
at SpaceEngineers.Game.Entities.Blocks.MyLandingGear.Init(MyObjectBuilder_CubeBlock objectBuilder, MyCubeGrid cubeGrid)
at Sandbox.Game.Entities.Cube.MySlimBlock.Init(MyObjectBuilder_CubeBlock objectBuilder, MyCubeGrid cubeGrid, MyCubeBlock fatBlock)
at Sandbox.Game.Entities.MyCubeGrid.AddCubeBlock(MyObjectBuilder_CubeBlock objectBuilder, Boolean testMerge, MyCubeBlockDefinition blockDefinition)
at Sandbox.Game.Entities.MyCubeGrid.AddBlock(MyObjectBuilder_CubeBlock objectBuilder, Boolean testMerge)

I would strongly urge you to change that code.
Calling GetCheckpoint() for every time a cube is added, will lead to lots of memory usage and performance issues.

You are also making improper use of Entity.NeedsUpdate.
This was detailed here:
https://forum.keenswh.com/threads/7395156

@Screaming Angels, thx for pointing me to the Entity.NeedsUpdate problem
Calling GetCheckpoint is in the part i havent created. But for me this part runs only if one of my LandingGears is placed. And it works for the most, why it will run into error if your mod is also running?

sorry, could you provide some more details please....
1) from what i can see the script is called when adding a gear, not "a block"..why/where is that causing memory usage and/or performance issues? (yes that could be done at mod-init once but i assume thats not your point)
2) GetCheckpoint calls a function in the engine which returns save folder name..why do we see a nullpointer when your speed mod is involved? We run the mod on a DS without speed mods from day one and have never seen that error messages....where is the missing link?

MyCubeBlock.Init is called every time the langing gear is spawned.

spawning includes:
* during game load -> ships with existing landing gear.
* player placing a landing gear block.
* in dedicated servers, when you move long distances the game will unload areas too far away, and load ares close by. This is called clustering by the Keen devs. Every time to move into an area you haven't been recently, it will download and spawn the ships. The blocks on the ships will be created anew.


GetCheckpoint("null") serializes the entire checkpoint content.
This is a performance issue, and so should not be called over and over.
The loaded Mods do not change during the lifetime of the game, so calling it once only is sufficient.



My Configurable Speed mod uses in game variables, which are set using the call MyAPIGateway.Utilities.SetVariable()
It isn't the only mod to use this. I beleive the laser shipyard mod uses this also.
The Variables are stored in the Checkpoint object by the game.


As for GetCheckpoint("null") failing. I honestly have no idea.
I call it in my Admin Helper mod to list the installed mods for users, and have never seen an issue calling it.
It may be that is does not like been called from MyEntity.Init
Then again, it could be a real bug in the game, which you will have to ask Keen to fix.

With SE code acces, I've been able to identify that one of the functions I call in the Configurable Max Ship Speed Mod is causing MyCubeBlock to prematurely initialize before other parts of the game are ready.
I've been able to change this function call, using a method that was previously unavaiable.

So both mods can now work togeather again.

Originally posted by Screaming Angels:

With SE code acces, I've been able to identify that one of the functions I call in the Configurable Max Ship Speed Mod is causing MyCubeBlock to prematurely initialize before other parts of the game are ready.
I've been able to change this function call, using a method that was previously unavaiable.

So both mods can now work togeather again.

Yay! Just tried it out and it's working perfectly. Thanks for looking into this, really appreciate it.

@Screaming Angels, thank you verry much

I've been having an issue with the gear not wanting to actually lock to anything once they are attached.

I was watching the upload of Capt. Shack's "Mod all the things" Exploration video and somone apparently told him you have to log out and back in after welding them?

yep, please read known issues, for now all moded landing gears i checked have this bug. After welding they cant log to anything. After realoding the world, it works fine.