Hi Srilatha, after clicking Proceed, have you tried to manually update the project before committing it?
What do you mean exactly by “I could not commit”?
E.g. are you getting an error? Is the Commit menu item grey-ed out? Is nothing happening when you commit?
Check the Collaboration Troubleshooting Guide section 6 https://docs.mendix.com/refguide7/collaborative-development-troubleshooting#6-another-operation-is-in-progress to get a better explanation about what is happening.
I hope this helps!