This sometimes happens when I open the file into new buffer.
function gitgutter#gitgutter..<SNR>204_repo_type_of_file..gitgutter#git#is_in_a_repo..vimproc#system..<SNR>276_system..vimproc#pgroup_open..<SNR>276_pgroup_open..vimproc#plineopen3..<SNR>276_plineopen..vimproc#fopen..<SNR>276_vp_file_open..<SNR>276_libcall, 行 16
vimproc: vp_file_open: ['open() error: 入力/出力エラーです']
Error occured while executing action!
Action name is open