Other contributors have said "How this error ocurred or how did this error ocurre?" is the same question as "Would you say How this error occurred or how did this error occur?" If you believe that these are not asking the same thing and should be answered differently, click here

Would you say How this error occurred or how did this error occur?

Answer:
The question would be the latter "How did this error occur?"

The former is the objective form, e.g.
"I am trying to discover how this error occurred."
First answer by Daisy Wei. Last edit by Dfoofnik. Contributor trust: 2551 [recommend contributor recommended]. Question popularity: 1 [recommend question].