Smart, Invalid package file format. Invalid header found.

On my 10.1 I am using Smart for updates. Everytime I start Smart I get following information: Invalid package file format. Invalid header found. After I click the OK box everythings runs as expected and I have not found anything informing me that there is something amiss. I am running Smart Package Manager 0.42. Can somebody tell me what and where I can "repair" Smart?