Karte kann nicht gespeichert werden: Die Mod Spell Pack (0.20.24) hat einen Fehler verursacht, der nicht behoben werden kann.
Bitte informiere den Autor der Mod über diesen Fehler.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions

I'm confused how it happened.

So, I updated, BUT it'll throw another error, which I need to see it in order to properly investigate the bug and fix issues.

2719.372 Error ParallelScenarioSaver.cpp:158: Saving scenario failed: The mod Spell Pack (0.20.27) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions
2719.381 Error Util.cpp:81: Attempting to create notice box in headless mode. Message: 'Cannot save map: The mod Spell Pack (0.20.27) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions'

------------- Error -------------
Attempting to create notice box in headless mode. Message: 'Cannot save map: The mod Spell Pack (0.20.27) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions'

Yeah, it has even more issues.

I'm guessing this was never able to be fixed, right? I just got the same error in a Rampent+Krastorio2 run.

Throw another log, it won't hurt ;)

Okay, it happened to me again two more times. I do have a bunch of mods loaded so there's a chance it's because of that. Anyways, here are two logs:

2604.269 Info AppManager.cpp:324: Saving to _autosave3 (blocking).
2605.651 Info AppManagerStates.cpp:2111: Saving finished
3370.871 Info AppManager.cpp:324: Saving to _autosave1 (blocking).
3372.168 Warning WriteFileGuard.cpp:52: Writing \MIAXRVMFP1\GROUPDATA\Residential Services\Residences\Techno Gym\Techno.MSOCache\Factorio_2.0.76\saves_autosave1.zip failed; previous version (if any) should still be available
3372.191 Error ParallelScenarioSaver.cpp:158: Saving scenario failed: The mod Spell Pack (0.20.28) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions
3558.732 Info AppManagerStates.cpp:1434: Deleting active scenario.

Second time:
4480.069 Info AppManager.cpp:324: Saving to _autosave1 (blocking).
4481.588 Info AppManagerStates.cpp:2111: Saving finished
5344.287 Info AppManager.cpp:324: Saving to _autosave2 (blocking).
5345.681 Warning WriteFileGuard.cpp:52: Writing \MIAXRVMFP1\GROUPDATA\Residential Services\Residences\Techno Gym\Techno.MSOCache\Factorio_2.0.76\saves_autosave2.zip failed; previous version (if any) should still be available
5345.688 Error ParallelScenarioSaver.cpp:158: Saving scenario failed: The mod Spell Pack (0.20.28) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event m-spell-pack::on_save()
Cannot serialise lua functions
5382.034 Info AppManager.cpp:353: Deleting active scenario.
5386.504 Quitting: user-quit.
5389.949 Goodbye

Please ignore the file location, it's on a work server.