I am not able to open the project in Mendix studio pro when I try to open the project in Mendix that time I get an error like this ( it appears you updated the app file outside of Mendix studio pro. would you like to merge the model changes now) and After the clicking on merge the changes button I get a message your app is locked, so what should I do plz help me
You can download and use tortoise svn to unlock and merge the changes.
That will mostly resolve the issue.
Download the updated project from the modular version control in teamserver.