我目前正在多个项目上进行svn 2 git迁移，并且能够转换某些项目而没有任何问题，但是对于一个项目，我遇到了问题，我不知道它是什么
我正在使用Atlassian演示的git svn实用程序进行迁移，并且使用的命令是
git svn clone --stdlayout --prefix 'svn/' --authors-file=authors.txt <svn_repo_url> --username $USER
我在执行过程中遇到的错误是
r17 = 55bf264a7d26920e3ac79a8b729d14c6d3c3c851 (refs/remotes/svn/tags/ABC_ProjectPlan)
r18 = a16307b240d2c0ca94d36de90ff0b14558e21a54 (refs/remotes/svn/tags/ABC_Requirements)
M Execution/Requirements/AE_09_ABC_SRS.docx
r19 = c148b71f0e5769bd34669d8f509c68f96e66db8f (refs/remotes/svn/trunk)
M Management/Review_Reports/AE_09_ABC_Gantt_ReviewReport.xlsx
M Management/Review_Reports/AE_09_ABC_ProjectPlan_ReviewReport.xlsx
M Management/Plans/AE_09_ABC_Gantt.mpp
M Management/Plans/AE_09_ABC_ProjectPlan.docx
r20 = 36001d215bf61d9fe2451fef7ad71723b93f5687 (refs/remotes/svn/trunk)
M Management/Review_Reports/AE_09_ABC_SRS_ReviewReport.xlsx
r21 = 933215b71ed9c601e05ca049f1355090f2a92e48 (refs/remotes/svn/trunk)
A AE_09_ABC_SRS.docx
r22 = d054d412799daac69c1c42ea27a5ec599088ffd4 (refs/remotes/svn/tags/ABC_Requirements)
Found possible branch point: https://urlpath/svn/projectname/trunk/Execution/Requirements/AE_09_ABC_SRS.docx => https:/urlpath/svn/projectname/tags/ABC_Requirements, 19
Initializing parent: refs/remotes/svn/tags/ABC_Requirements@19
fatal: Not a valid object name
ls-tree -z ./: command returned error: 128
此错误的确切含义是我无法理解。 git版本2.11.1和svn版本1.8.14