Make sure you have a title for your story. Don't try to put a bunch of symbols, pictures or videos in your story. Just post it without messing with the draft function.
Don't place web addresses in your stories. EP is working on making sure people aren't posting advertisements and spam in their stories. If you are posting that kind of stuff, then it will not be approved.
Well if you did then maybe you wouldn't get the error message :)
May b u r missing d category in whichu want to locate ur story?
That used to happen to me too ,EP has glitches from time to time.