No tracked branch configured for branch dev or the branch doesn't exist. To make your branch track a remote branch call, for example, git branch --set-upstream-to=origin/dev dev

Android studio出现了这个问题，最后解决如下：
git branch --set-upstream-to origin/dev
根据提示，后面加上分支的名字"orign/dev"

来源：https://www.cnblogs.com/wisdomzhang/p/12325301.html