They have same privileges as yours..?
Ask them to create a new report using existing extracts and publish report in the server, While publishing if they get mention error then it might be issue with extracts. If there is no problem with new report. Please try to recreate extracts and republish.
He saved the published dashboard with web edit option and working on that copy. some updates happened in the DB,He want to refresh that file.
he is unable to do it.