The corrected sentence is: Everyone has gone to the party except Carole, who has the flu.
What is the error made in the sentence?
The first error made in the sentence is the misuse of the word "went." The correct past tense form of the verb "go" is "gone."
Therefore, one can see that the second error made in the sentence is the use of "accept" instead of "except." "Accept" means to receive or agree to something, while "except" means to exclude something.
So, one can say that in this case, we are trying to exclude Carole from the group of people who have gone to the party, so we should use "except."