The problem is that I am getting this kind of an error:
Publish status error in build #41 {build id=111, buildTypeId=Sandbox_Build}:Cannot publish status to Upsource for VCS root https://bitbucket.org/cogdevs/sandbox#refs/heads/master:
response code: 404, reason: NOT FOUND
I've found similar topic, where TS mentioned that he somehow reconfigured VCS, but it was not specified in which way, so I don't know how to solve this issue.