ssh - Operation is not supported SmartGit -

i'm on elementary os, connected server via ssh. locally started make project , wanted push server. through file system can create , delete folders , files. on server created folder , smartgit initialized git repository. after that, tried push local master branch first commit got error this:

not ref have been pushed.  delta compression using 4 threads. total 376(delta 55),reused 0(delta 0) remote: fatal :write error:operation not supported. 

on same server connected repository via ssh, , works fine. can make pull , push without error. did miss something?