I was facing the same issue, the problem for me (and I guess that for you too) was that there was selected the option "Default[Global]" in the Update Set selector (to the left of the scope application selector).

Then, looking in the Local Update Set table, there was no Update set associate to the NeedIt Aplication (At this point I have no idea what caused it since it's suppose to be created when the application is created) 

My solution was to reset and wipe my intance (it takes like 1 hour) and start from 0.
Then, in Studio I selected the Import from Source Control option and linked it to my git repository.

I verified that the Update Set was created and then I changed to the last branch.

Hope you find this useful

PD: This is an solution, maybe not the best. I'm interested on learning what was the problem with the UpdateSet, so if anyone knows what happened and how to fix it, plss reply me