为什么提交htemes/next总是失败

$ git add -i
           staged     unstaged path
  1:    unchanged        +0/-0 themes/next

*** Commands ***
  1: status       2: update       3: revert       4: add untracked
  5: patch        6: diff         7: quit         8: help
What now> 4
No untracked files.

$ git add -A

$ git status
On branch blog
Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)
  (commit or discard the untracked or modified content in submodules)

        modified:   themes/next (modified content)

no changes added to commit (use "git add" and/or "git commit -a")