Just thought I'd update this. Entities are now spawning in when the sector import is completed. I did not check if there are still errors in the logs though.

0.199.532 or higher

ClassCastException and missing planet cores?
Not entirely sure, logs:

-Validated-

misclicked on "closed" instead of "resolved"

fixed Nullpointer. Both fixes 0.199.531 or later

Logs for the nullpointer:

[2017-04-20 01:35:56] [RAIL] Client(1) DISCONNECTED FROM RAIL: Ship[schema_1492644932863](517) LEFT IN RAIL SpaceStation[ENTITY_SPACESTATION_Big shipyard V2_1492644923502(516)]: []
[2017-04-20 01:35:56] java.lang.NullPointerException
[2017-04-20 01:35:56] 	at obfuscated.aaz.a(SourceFile:952)
[2017-04-20 01:35:56] 	at obfuscated.Yc.updateLocal(SourceFile:2731)
[2017-04-20 01:35:56] 	at obfuscated.Yr.updateLocal(SourceFile:403)
[2017-04-20 01:35:56] 	at org.schema.game.common.controller.EditableSendableSegmentController.updateLocal(SourceFile:1168)
[2017-04-20 01:35:56] 	at obfuscated.YA.updateLocal(SourceFile:493)
[2017-04-20 01:35:56] 	at obfuscated.J.update(SourceFile:1333)
[2017-04-20 01:35:56] 	at obfuscated.aFN.a(SourceFile:719)
[2017-04-20 01:35:56] 	at obfuscated.aFT.b(SourceFile:698)
[2017-04-20 01:35:56] 	at obfuscated.V.e(SourceFile:1110)
[2017-04-20 01:35:56] 	at org.schema.game.common.Starter.startMainMenu(SourceFile:1489)
[2017-04-20 01:35:56] 	at org.schema.game.common.Starter.main(SourceFile:1034)

Fixed class cast exception

I decided to also test on our server, since I have full access to the logs and could submit them here. I thought it might also be useful to have a snapshot from whatever the issue may have been on the version we are currently running.

Thread dump when class cast exception occurs (taken with VisualVM):

And furthermore, when docking a ship to the shipyard and manually undocking, also causes a crash to main menu. When rejoining the server, the ship was also gone.
No trace of it.

Also possibly related. If you enter the design ship (not physical), then bring up the DEL menu and click the "Undock all" button, it will crash you. Upon rejoining, all the docked entities on the design are gone. Unloading the design and reloading it works, but the entities are still undocked.

Optimized Data (disabled for now. need extra checking)

This is a result of a fix attempt, merging with older task. Thanks for reporting.

Merged with older task, it's the same issue so subscribe to that one to stay up-to-date with its changes.

didnt work i redownloaded the complete game and it looks still broken.
Its only with the recent Pre-build.

Can you please delete the /data/textures directory inside your starmade installation and use the "download normal" option in the launcher screen to restore all textures to default?
(It looks like a broken texture download)

I am on single Player. Using the Default texture pack.(Didnt Change anything)

Are you on single player?
Or on a server that may have custom textures?

I can start the game but some textures seems to be missing

Edit: Since I cannot edit the main thread here any longer, I'm going to track my tests here. If a command results in an error, crash, or other noticeable bug, I'll put it under an "error" section. All of these tests were done spawning in or modifying an entity that had no faction block on it.

classcastexception when you use it, don't need logs since it's already fixed.

Aye, fixed. Forgot to set to resolve. Thanks for reporting

So far in version 0.199.497 this bug has not been seen so this is probably fixed.

Was due to WiP on fixing mac frame buffer usage. Should be ok now

Merging with other task.

Thank you for the report.

Ah great,
you are using the pre-release build for this.