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Hi everybody, I have a small doubt, I hope any of you could help me.
The problem is with the preposition "on" and "in" with the word "error".
I've seen sentences with "error in" and "error on". But I don't know when to use on or in.
I give some examples I found:

1- Any Spelling or grammar ERROR ON Items 3 or 4 or 5 result in
a -40 point penalty

2- Lab project 7 has an ERROR IN the grammar that has been confusing students

3- The company reported the ERROR ON Sept. 15

4- A smaller network gave over 20% ERROR ON the same test set

5- What gives you the right to say what an ERROR IN English is?

6- Unfortunately, we are unable to quantify the effects of these sources of ERROR ON our results

7- Human ERROR IN Medicine

8- Reducing ERROR IN mail surveys
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Hello

"Error" is usually followed by "in X". The X is a word or phrase that expresses some activity
[2] Lab project 7 has an error in [using] the grammar (activity) that has been confusing students
[5] What gives you the right to say what an error in [speaking/writing] English (activity) is?
[7] Human error in medicine (activity)
[8] Reducing error in mail surveys (activity)

"Error on X" is also possible when X denotes a position where the error takes place.
[1] Any spelling or grammar error on (at the position of) items 3 or 4 or 5 result in a -40 point penalty

The "on X" in the following sentences are not used as a modifier of "error".
[3] The company reported the error on (=on the day) Sept. 15
[4] A smaller network gave over 20% error on (=on the occasion of) the same test set
[6] Unfortunately, we are unable to quantify the effects (of these sources of error) on our results

paco
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paco