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I had the same problem and I have resolved it by going through the following steps.

If you need to keep your changes -

1. First you need to run git checkout master command to put you back to the master branch.
2. If you need to keep your changes just run git checkout -b changes and git checkout -B master changes

If you don't need your changes

1. To removes all untracked files from your branch run git clean -df .

2. Then you need to clear all unstaged changes within your repository. In order to do that you have to run git checkout --

3. Finally you have to put your branch back to the master branch by using git checkout master command.