Saturday, January 30, 2010

Solution for: "Cannot open TWAIN source" (Canon)

24.01 Error message:

  • "Cannot open TWAIN source"

Affected products:

  • Canon scanners like the "CanoScan LiDE 60"

What does not hep:

  • Updating/reinstalling CanoScan toolbox or drivers
  • Trying other USB ports


  • Shorten your "PATH" environment variable. If the resulting variable is "too long", the TWAIN error will occur. After shortening the path, scanning will immediatly work (no restart required.)

(Thanks to “Graf_d” from this thread for providing the solution)