Unable to checkout '9cc90b7976252b2d14b7956230c5870097e1f008' in submodule path 'doxygen2jsdoc'

[hitfzyangdianshi]

I find similar issue at intel-iot-devkit/doxygen2jsdoc#2

Submodule path 'doxygen2jsdoc': checked out '67cad692720982ac3cbd99bf1c3421edc69b08f9'
Cloning into 'doxyport'...
remote: Enumerating objects: 55, done.
remote: Total 55 (delta 0), reused 0 (delta 0), pack-reused 55
Unpacking objects: 100% (55/55), done.
Checking connectivity... done.
Submodule path 'doxyport': checked out 'db3e1a6eb8677d3166d90d82c3068689803ce547'
warning: unable to rmdir doxyport: Directory not empty
M	doxygen2jsdoc
Note: checking out '70600dece4138b0c0dbaff42f57828f1559cd840'.

You are in 'detached HEAD' state. You can look around, make experimental
changes and commit them, and you can discard any commits you make in this
state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may
do so (now or later) by using -b with the checkout command again. Example:

  git checkout -b new_branch_name

HEAD is now at 70600de... mraa: update to version 0.8.0
fatal: reference is not a tree: 9cc90b7976252b2d14b7956230c5870097e1f008
Unable to checkout '9cc90b7976252b2d14b7956230c5870097e1f008' in submodule path 'doxygen2jsdoc'
make[3]: *** [/home/qwertyu/openwrt15.05/dl/libmraa-0.8.0-70600dece4138b0c0dbaff42f57828f1559cd840.tar.gz] Error 1
make[3]: Leaving directory `/home/qwertyu/openwrt15.05/feeds/packages/libs/libmraa'
make[2]: *** [package/feeds/packages/libmraa/compile] Error 2
make[2]: Leaving directory `/home/qwertyu/openwrt15.05'
make[1]: *** [/home/qwertyu/openwrt15.05/staging_dir/target-mipsel_24kec+dsp_uClibc-0.9.33.2/stamp/.package_compile] Error 2
make[1]: Leaving directory `/home/qwertyu/openwrt15.05'
make: *** [world] Error 2

[hitfzyangdianshi]

solved: intel-iot-devkit/doxygen2jsdoc#2 (comment)