Hi! There are changes commited on your project, (probably not by you) and you need to update (like were you are working on is not up to date) before beign able to commit your part.
I never work with svn but the text you get in the screen is not related to that
Hope it works!
Click yes, and after updating and committing…. start with converting your model to Mx6 > Mx7 > Mx8 at least. As Mx5 and Mx6 aren't supported anymore. And Mx7 will become unsupported end Q1 2023 Q2 latest.