GIT Switch branch is unsuccessful

This error occurred during the branch switch in idea, causing the switch to fail: Error:the following untracked working tree files would be overwritten by checkout
The error indicates that some of the problems caused by untracked working tree files. So as long as the solution of these untracked files can solve this problem.

Workaround:

open sourcetree through the command line, into the local version of the repository directory, directly execute the git clean-d-fx can be. Probably a lot of people do not understand what-d,-fx mean, in fact, git clean-d-fx said: Delete some files without git add;

git clean parameter- 

n shows the files and directories to be deleted;-

x-----Delete ignore file Files that have not been recognized for git-

d-----Delete files that have not been added to Git's path-

f-----Force

git clean-n

git clean-df

git clean-f