Boot time scan repeatedly uncovers the same issue, Error 42051

Since May every Boot time scan I have done has run across the same issue with the downloaded executable from Malwarebytes. Didn’t occur before May, and the executable has not changed since original installation last year. The scan I did today uncovered a simular issue with a restore file that also has not been modified as far as I can tell. Here is a copy of the script in the log:

08/25/2010 10:20
Scan of all local drives

File C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes’ Anti-Malware\mbam-setup.exe{embedded}\setup.exe Error 42051 {Unknown packer version.}
File C:\System Volume Information_restore{14157744-4FA2-4CAF-BAFB-72CC49941087}\RP859\A0064042.exe{embedded}\setup.exe Error 42051 {Unknown packer version.}
Number of searched folders: 8118
Number of tested files: 419067
Number of infected files: 0

What is a “Unknown packer version”?
Is it something I need to be worried about? What actions should I take?
Is there somewhere I can go to get the definitions of this and other error codes and appropriate actions? ???

No, you don’t have to worry about.
Malwarebytes uses a new version of the particular installer (Inno Setup) and your version of avast! is not able to unpack it and scan its content.

I’d suggest to upgrade from avast! 4.x to avast! 5.0.