I have the same issue and searching and reading endless things on this subject leads me to believe there is something in the swatch script that causes their to be no data put into the mta table in mysql.
In this post it talks about a change in the script,
Logger service issues . I am running 4.5.10 on centos 5. It has not worked since like 4.5.6.
I don't know enough about the script file but it seems like the error is really about the data not showing up in the mta and mta_aggregate database tables.