Warren Gatland was not happy with a disallowed try after Wales lost to England in their second Six Nations match of the 2018 campaign.
Television match official Glenn Newman ruled Anthony Watson had beaten the Wales full-back to the ball during the first half at Twickenham.
The Wales head coach disagreed, saying: “It looked like a try to me.
“To me it’s disappointing that they get the decision wrong and in such a pivotal moment of the game.”
Gatland added: “They fly a guy over from New Zealand to be TMO and he has one big call to make and unfortunately I think he’s made a terrible mistake and at this level I think that’s pretty disappointing.
“I thought the wording was odd. “No clear downward pressure from Wales” and I saw that completely different.
“Human error, he makes a mistake, but at this level guys have got to make this decision right.
“You can understand. People make mistakes.”