I am not sure if this has anything to do with the SCM system and its usage. There is also no information at all in the question that could be used for anything. Unless you can provide additional information I consider the question pointless, except some hints that you could follow. You did not provide any information where and how the build was executed, so I would suggest to check the build, the build result and all the other information that is produced in the build. Here you can see what happened and what went into the build. You will be able to identify the failing code and how it came about.