当我在命令行上放置此命令时，它显示以下错误。
$ git pull origin branchname
remote: Counting objects: 30138, done.
remote: Compressing objects: 100% (21286/21286), done.
fatal: The remote end hung up unexpectedly2.97 MiB | 511.00 KiB/s
fatal: early EOF
fatal: index-pack failed
请帮我解决这个问题。