Factorio Forums

I've now got two different reports, that my mod is causing the error when adding it to an existing save, where it previously was not used.

Screenshot of the error:


I also found a way to reproduce this now:
- Download the zip-file: https://drive.google.com/file/d/1VWVrPs ... sp=sharing
- Move the mods directory from the zip-file into an factorio headless server
- Start the server with the save (also included in the zip-file)
- Then sync a client with the server and connect to it. The Client should not be able to connect to the server, with the script-mismatch error.

The original server and client logs are also included in the zip. I tested it mostly on my Ubuntu 18.04 machine.

What i checked so far:
- The checksums in the logs are all identical.
- The checksum of the mod-zip-files are identical on server and client
- The zip file integrity has no errors (tested with unzip -t)

My mod: https://mods.factorio.com/mod/belt-balancer
source-code: https://github.com/knoxfighter/belt-balancer

Why is this script-mismatch occurring, although the scripts and modfiles are surely identical? What can i do to prevent this in the future?
And why does saving and loading the save (aka. restarting the server) fixes the error?

If you've touched the base game files, e.g. those in steamapps/common/Factorio/data/base/ or date/core/ then it's possible you have inadvertently edited the base game files causing checksum mismatch (on level.dat - not your mods files)
Same goes on the other end - something on the server may be altered. can other people join it?

Basically reinstall factorio. *Worst case scenario.

Was an interesting theory, but this happens also happens, on a completely fresh installation of factorio with a fresh dedicated-server and a newly created save.

What OS/filesystem is the server and client? Is it possible there's something odd going on with how the server handles files (moving/sandboxing/flushing to disk/etc)? FreeNAS/normal Linux's is all I'd have knowledge about.

It is tested on my ubuntu 18.04 machine. The server was also an Ubuntu 18.04 where the log is from.

More tests results, i tested it on all my available hardware:
- Ubuntu 18.04 Client -> Ubuntu 18.04 Headless Server
- Ubuntu 18.04 Client -> Windows 7 Server
- Windows 7 Client -> Ubuntu 18.04 Headless Server
- Windows 7 Client -> Windows 7 Server
- Ubuntu 18.04 Client -> Windows Server 2016 Standard Server
- Windows 7 Client -> Windows Server 2016 Standard Server

All result in the described error.

And i currently don't have anybody that can join, except me. So i setup a Server with this error, so you can try to connect yourself: crosant.de:10258
Server is Factorio 0.17.79

Anybody has any idea, whats going on here?
And also that log output feels weird, like, the string concatenation is broken and not all information is printed

Have you tried it without the migration files?

You fiddle with the globals, maybe the game has an issue with this during migration.

Sounds more like a case for on_configuration_changed.

yep, you were correct, the migration files are the problem.

As soon as i have a `require` in one migration file, the script mismatch occurs.

That is definitely a bug inside factorio, i will create a bugreport for that. Thanks for the thoughts and the help