Error while pushing gem to rubygems (Psych::SyntaxError)

Error while pushing gem to rubygems (Psych::SyntaxError)

I tried doing rake release but that hangs..
then seeing this
http://help.rubygems.org/discussions/problems/7607-rake-release-hangs-on-new-gem-submission
I've deleted the .gem that got created and built it with
gem build mygem.gemspec
and then I tried to gem push the gem created and got
C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse': (<unknown>): control
characters are not allowed at line 1 column 1 (Psych::SyntaxError)
from C:/Ruby193/lib/ruby/1.9.1/psych.rb:203:in `parse_stream'
from C:/Ruby193/lib/ruby/1.9.1/psych.rb:151:in `parse'
from C:/Ruby193/lib/ruby/1.9.1/psych.rb:127:in `load'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:318:in
`load_file'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:270:in
`load_api_keys'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/config_file.rb:286:in
`rubygems_api_key'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/gemcutter_utilities.rb:31:in
`sign_in'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/commands/push_command.rb:39:in
`execute'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command.rb:305:in
`invoke_with_build_args'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command_manager.rb:170:in
`process_args'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/command_manager.rb:130:in
`run'
from
C:/Ruby193/lib/ruby/site_ruby/1.9.1/rubygems/gem_runner.rb:60:in
`run'
from C:/Ruby193/bin/gem:21:in `<main>'
using ruby 1.9.3 and latest rubygems 2.0.7
What can I do to push my gem?