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The phrase "a serious error of" is correct and usable in written English.
It can be used when discussing a significant mistake or fault in judgment, reasoning, or action.
Example: "The report contained a serious error of calculation that affected the final results."
Alternatives: "a grave mistake in" or "a critical error in".
Exact(58)
I believe this isn't just a serious error of judgment.
"Certainly it was a serious error of judgment.
The committee said this was "a serious error of judgment".
It soon became evident that this was a serious error of judgment.
"It was a very, very poor decision and a serious error of judgment".
That was a serious error of judgment for which Prudential is paying the price.
Now, I believe this isn't just a serious error of judgment.
Hickinbottom stated that one of the club's sports physicians made a "serious error of judgment".
The decision to pull American troops out of Syria is a serious error of judgment.
Similar(2)
The sense of an open contest in which United might streak ahead at this point was confirmed when Richard Keogh made a serious error in front of Carson.
Every time that he'd be on a streak of good, solid performances at the centre of his team's defense, scoring a goal every now and then, he'd commit a serious error that, regardless of whether it cost his team dearly or not, would put serious doubt on his ability to keep his concentration and his defensive skills.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com