I added multipleunittraincontrol as well as the lib mod required by it.
I loaded the game and got hit with: https://i.imgur.com/97kgnIA.png

I hit "Disable listed mods" and it loaded.
I went in and reenabled everything except MUTC and it loaded.

I am unsure how to interpret this error message.

Is this something you would be able to fix?

The circular dependency is caused by MUTC, Electric Train and Krastorio 2. Not sure how long it's been the case. It will be annoying to fix, so in the meantime you will have to disable one of the three mods (probably MUTC).

If ElectricTrain, Krastorio2, and Multiple Unit Train Control are installed, it causes a circular dependency issue.

The best way to resolve this issue is to remove "?MultipleUnitTrainControl" from the dependency list of ElectricTrain. From my testing, this does not affect anything (all the power and grid changes are still made to both regular and MU versions, thanks to the latest MUTC updates). This ensures that the load order is ElectricTrain -> Krastorio2 -> Multiple Unit Train Control.