On opening a received email I get an error message on top of the email saying,

"An error has occurred in the script on this page."

Error: Object doesn't support property or method 'adEventListener'

URL:  wlmailhtml:{AF2880B9-1A8D-4A09-AD43-85A15BA5F0C5}mid://00000004/

"Do you want to continue running scripts on this page?   "Yes  No"

What is causing this error and how can I fix it?