Permission denied reading in .ssh/

Executing this:

osm ns-create --ns_name proxycharm --nsd_name hackfest_proxycharm-ns --vim_account microstack-site --ssh_keys .ssh/id_rsa.pub

It happens the following:

Traceback (most recent call last):
  File "/snap/osmclient/37/bin/osm", line 11, in <module>
    load_entry_point('osmclient==6.0.1+gb2829e9', 'console_scripts', 'osm')()
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/core.py", line 764, in __call__
    return self.main(*args, **kwargs)
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/core.py", line 717, in main
    rv = self.invoke(ctx)
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/core.py", line 1137, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/core.py", line 956, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/core.py", line 555, in invoke
    return callback(*args, **kwargs)
  File "/snap/osmclient/37/lib/python2.7/site-packages/click/decorators.py", line 17, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/snap/osmclient/37/lib/python2.7/site-packages/osmclient/scripts/osm.py", line 1169, in ns_create
    wait=wait)
  File "/snap/osmclient/37/lib/python2.7/site-packages/osmclient/sol005/ns.py", line 161, in create
    with open(pubkeyfile, 'r') as f:
IOError: [Errno 13] Permission denied: u'.ssh/id_rsa.pub'