error running - gl commit

[shaal]

trafficstars

I use Ubuntu 17. When I run gl commit, and then writing a short explanation on the commit, I am getting this error -

✘ Some internal error occurred
  ➜ If you want to help, see http://gitless.com for info on how to report bugs and include the following information:
  
  0.8.5
  
  Traceback (most recent call last):
    File "gitless/cli/gl.py", line 82, in main
    File "gitless/cli/gl_commit.py", line 73, in main
    File "gitless/core.py", line 1202, in create_commit
    File "gitless/core.py", line 1174, in get_tree_and_update_index
    File "gitless/core.py", line 1167, in update
    File "pygit2/index.py", line 170, in remove
    File "pygit2/errors.py", line 53, in check_error
  IOError: Index does not contain config/core.base_field_override.node.page.promote.yml at stage 0