Anybody trying to use “show notification” Applescript with Quicksilver b54 (3815) may get this error: “Quicksilver got an error: Some parameter is missing for show notification”
Looks like it is a bug on this version, as more people reported here.
You may try providing all parameters. Here are some examples:
tell application "Quicksilver"
show notification "QS Notification" text "QS text" image name "Quicksilver.icns" image data read (path to resource "Quicksilver.icns") as picture
show notification "Yes Notification" text "Yes text" image name "BooleanYES.png" image data read (path to resource "BooleanYES.png") as picture
show notification "No Notification" text "No text" image name "BooleanNO.png" image data read (path to resource "BooleanNO.png") as picture
show notification "Toggle Notification" text "Toggle text" image name "BooleanTOGGLE.png" image data read (path to resource "BooleanTOGGLE.png") as picture
show notification "App icon" text "App icon text" image name "com.apple.safari" image data read (path to resource "Quicksilver.icns") as picture
end tell
Now it should work. Note that the displayed image will be defined by the image name, not the image data, which seems to be just ignored.