I have seen this error on yesterday morning but when I manually run the distributed replication task, the task was completed seccessful. I am not sure what caused this.
Have you tried running manually?
Yes I have run the 'Update Master Repository' task from the Server Task page and it seems to go through saying everything is up to date. Have tried clearing IE cache on the server, also clearing out the windows temp folder on the server too. Just an irritation at the moment as I get the email every hour saying that it failed. Will see what tomorrow brings...