If you installed Quark 6 in your system, most probably you will have an item called "QXPScriptingAdditions.osax" in your "/Library/ScriptingAdditions" folder, which "provides internal scripting support for QuarkXPress".
But a bad aete design inform us about this using a command called "NOTE", which means that:
display dialog "hello" with icon note
wont work anymore, since it will map to:
display dialog "hello" with icon NOTE
which will throw an error.

This patch simply renames such command to "NOTEx", so it doesnt interferre with your dialog scripting work.

Apply the patch
Open your "/Library/ScriptingAdditions" folder, pick the item "QXPScriptingAddition.osax" and drop it into the patcher, "QXPScriptingAdditions Patch".
It will generate a new fresh copy of such addition and will rename the old one to "old_QXPScriptingAddition.osax". Remove this from the ScriptingAdditions folder, and keep it in a safe place, just in case you need it again.
Now, you can script your "icon note" again!