The phrase "a critical error in" is correct and usable in written English.
It can be used when discussing a significant mistake or fault within a system, process, or document.
Example: "The software update resulted in a critical error in the system, causing it to crash unexpectedly."
Alternatives: "a major flaw in" or "a significant mistake in".
As I filled out more applications, I discovered a critical error in my strategy.
Prof Baker, a former hospital medical director, said the NHS had made a critical error, in failing to take decisive action under the last Labour government, when it became clear that reforms to build community services were required.
Machado, the third baseman for the Orioles, had never played on the plastic grass of Tropicana Field, and on Monday he made a critical error in a 5-3 loss to the Tampa Bay Rays.
Billy Slater, the deadly Australia full-back who was guilty of a critical error in the 2008 final when returning the ball into play near his own try-line, has recovered from a knee injury and will start, meaning Greg Inglis will move to centre.
In combing through the Stanford study she's not only noticed a critical error in properly identifying a class of nutrients, a spelling error indicative of biochemical incompetence (or at least an egregious oversight) that skewed one important result, but also that the researchers curiously excluded evaluating many nutrients that she found to be considerably higher in organic foods.
Before arriving in Seattle, the Yankees had been swept in a four-game series in Oakland and were four outs away from a 1-6 trip when Nix, who made a critical error in one of the losses against the Athletics, delivered the winning hit.
Facebook made a critical error of judgement in indiscriminately allowing anyone to access to conscenting users and that user's entire list of friends.
"I think we made a very critical error in 2008, because we were trying to get a candidate who could beat Hillary or Obama," she told HuffPost on Tuesday.
But in a critical error, Chief Judge Norma Holloway Johnson decided the article contained secret grand jury information -- though nothing in it remotely resembled such information.
If it's a question of someone to go head to head with Trump and other personalities in his pirate crew, you have to go with the guy who only lost 1976 and 1992 Democratic presidential nominations to Jimmy Carter (Brown ran out of running room after a very late-breaking campaign) and Bill Clinton Brownn made a critical error which lost his big lead in the turning point New York primary).
In other words, a critical error should not have the effect of merely diminishing an overall quality score; it should obliterate the score.
