It is not clear that these log messages represent something that needs to be fixed. These log messages are generated because there is an access (xxx in your message which I assume is some number or some name that you have obscured) which is denying traffic and the access list was configured to log the denied traffic.

Whoverer configured that access list thought that it would be helpful to log that denied traffic. Perhaps they thought that someone would investigate the denied traffic and find a situation that could be improved (perhaps some misconfigured device generating improper traffic) or perhaps they thought it helpful to document invalid traffic (some of my customers do that on outward facing routers so that can understand attempts to access their network). If the messages are not helpful you can edit the access list and remove the log parameter on the lines where it is configured. This will stop these messages in your log.

HTH

Rick