This is the 491st most frequent Japanese word.
発生
Occurrence; generation; outbreak.
Here, 発生 is used to indicate the occurrence of a significant event, typically used with natural phenomena or incidents.
地震が発生しました。
An earthquake occurred.
In this sentence, 発生 is applied to the emergence of something new, usually concerning diseases or problems.
新しいウイルスが発生したと言われています。
It is said that a new virus has emerged.
Here, 発生 describes the potential occurrence of an undesired event, in this case, a system error.