Problem solved.
I tried step by step according to this guide:https://support.sega.com/hc/en-gb/articles/11568479123857-What-should-I-do-if-I-receive-an-XML-error-message-when-launching-or-running-Football-Manager-
Finally I solved it during the last step:
I checked each folder, and found my problem in the editor data file. Here I had stored a folder downloaded from https://www.fmscout.com/a-fm23-leagues-pack-by-timo.html. There are so many single files in it with some invalid. After deleting the folder, the problem was solved. Also, the game works well if I only store the valid files directly under the editor data directory rather than under a secondary folder.
I think my problem was due to excessive invalid files in the editor data folder. Hope this will help.
