Jessica Ennis hit out at the officials at the Powerade Great CityGames as an embarrassing blunder denied her a personal best in the 100 metres hurdles.
The heptathlete produced a fantastic run to win the race on the raised track on Manchester's Deansgate, only to be told that nine hurdles had been set out instead of the regulation 10. The organisational error meant her time - 12.75 seconds into a headwind - a time 0.04secs faster than her previous best - was invalid.
Ennis said: "I can't believe that. It's a great event, but that's a massive, massive mess-up. You expect that all the hurdles will be out and everything's the way it should be. You just run as fast as you can and get across the line and that's what I did, but unfortunately it wasn't set up right."
Nova International, the organisers of the event, appeared to lay the blame at the door of UK Athletics employees.
A Nova spokesman said: "We can confirm that due to human error only nine sets of hurdles rather than the required 10 were put out on the track for the women's 100 metres hurdles event this afternoon.
"We employ leading UKA officials to manage this vital element of the event on our behalf, and we will of course be investigating this unfortunate occurrence with them."
Organisers only confirmed the error about 30 minutes after the race, although Kelly Sotherton, Ennis's fellow heptathlete, was quick to point it out on Twitter.
The 2004 Olympic bronze medallist, who famously nicknamed Ennis 'tadpole' when the face of the London Games was an up-and-coming athlete, said: "That 100mh was great but I'm sure that there was only 9 hurdles not 10. Please someone verify!"
She later tweeted: "I feel bad! People probably think I'm being a cow bag!"
Ennis, who has lost her world titles indoors and out over the last nine months, will next weekend compete in her first heptathlon of the Olympic year in Gotzis, Austria, against her main rivals for gold in London.