Learn a Phrase: Without a Hitch

Well, I thought I knew the word "hitch" already. However, when I saw the following title, I realized that I still did not know the phrase "without a hitch" yet. Can you figure it out?

Beijing iPhone Launch Goes Off Without a Hitch
http://blogs.wsj.com/digits/2013/09/20/beijing-iphone-launch-goes-off-without-a-hitch/#!

Surfer_Diver
2013.9.20

所有跟帖： 

• without any reason or any clues? I just guessed from the context -hjs2010- ♂ (0 bytes) () 09/21/2013 postreply 05:06:46

• with no problem -~葉子~- ♀ (0 bytes) () 09/22/2013 postreply 21:54:49

• Very good! -衝浪潛水員- ♂ (0 bytes) () 09/22/2013 postreply 22:32:44

• Without a Hitch -newton123- ♂ (779 bytes) () 09/27/2013 postreply 10:08:53