Make failed because of no 64ee151d07a65dd0a77039817cb9a7fa11b53a6e in genode.git

[zhoupeng]

There seem be no commit 64ee151d07a65dd0a77039817cb9a7fa11b53a6e in genode.git repo.

logs:
cd genode.git; git reset --hard 64ee151d07a65dd0a77039817cb9a7fa11b53a6e
fatal: Could not parse object '64ee151d07a65dd0a77039817cb9a7fa11b53a6e'.
make[1]: *** No rule to make target 'genode.git/checked_out.tag', needed by 'class_index.mk'. Stop.
make[1]: Leaving directory '/home/zp/stemos/genode-manual.git/manual/spec'
make: *** [Makefile:49: spec/classes] Error 2