[Unable to update the .sln file]

Ok, update:

I was able to solve it by doing the next black magic ritual:

- Undo the changes

- Check out the file and check it in WITH NO CHANGES (apparently that's a thing we can do)

- Reload unity so it updates the solution

- Check it in again now with changes

I still would like to understand the technical reasons behind it, but at least I can work now...

[Unable to update the .sln file]

Hey there! I have encountered a weird problem after updating some of my own assets and bringing them into the project.

Basically I have added some assembly definitions so the solution file for my project got updated, but no matter what I do - plastic won't let me commit it, which is very frustrating.

I use only the main Plastic SCM client (with no unity plugin or the built-in Plastic SCM integration). I attached the screenshot of the error.

As the message suggests - I tried undoing things, then relaunching unity and checking-in again - but it creates the same error. I also tried removing all the new assembly references that were added to the file but that also throws an error. So far I am completely unable to check-in the file which is extremely frustrating.

I really wish I could also understand what does "not being in sync with the changeset" means, considering I completely undid the changes, made sure everything is updated and tried to commit it again.