I got this bug when loading up a save I started a few hours ago:

Error while applying migration: Train Tracker: framework_gui.lua

train-tracker/framework/init.lua:105: configuration must either be a table or a function that provides a table
stack traceback:
[C]: in function 'assert'
train-tracker/framework/init.lua:105: in function 'init'
train-tracker/migrations/framework_gui.lua:8: in main chunk

Please try the latest version, this should be fixed.

I don't see a new version on the portal?

I realized that you are on 2.0, not 2.1.

Use 1.3.0 (just released) for 2.0, 2.2.0 for 2.1

Thanks, much appreciated!