android repo and git expert

Dear all, I have an external SSD drive i am trying to do a repo sync to an external drive repo sync completes fetching 83% and finally fails with error message: -------------------------------------------------------- [login to view URL]: platform/frameworks/compile/libbcc rev-list (u'^0e1a7167e4c7a9ebf4eb7c107103743615332a0d', 'HEAD', '--'): fatal: bad object 0e1a7167e4c7a9ebf4eb7c107103743615332a0d -------------------------------------------------------- can some one who is expert in repo help me fix this issue or let me know why is this issue occuring the external SSD has a ext4 filesystem