"git submodule update" fails

I get following error message when I run git submodule update:

error: Server does not allow request for unadvertised object c28a317661fcdd184f65801eef08e8e375066ed5

Fetched in submodule path 'dynet', but it did not contain c28a317661fcdd184f65801eef08e8e375066ed5. Direct fetching of that commit failed.