VBS / iMacros - What is error code -911

What is this error code?

The link -100...-999 (sMacroError) on this page just reloads the SAME PAGE again. Great.

I get this error when I execute this .vbs file:

Option Explicit
Dim iim1, iret

'initialize iMacros instance
set iim1 = CreateObject ("iMacros")
iret = iim1.iimInit("-fx", false)

do while not iret < 1
iret = iim1.iimPlay("Load CNN Comments",30)
loop

' tell user we're done
msgbox "End." &iret

' exit iMacros instance and quit script
Wscript.Quit()   

Here is "Load CNN Comments"

VERSION BUILD=6650406 RECORDER=FX
TAG POS=1 TYPE=A ATTR=TXT:Load<SP>next<SP>25
WAIT SECONDS=#DOWNLOADCOMPLETE#   

I run this with a CNN.COM article open in Firefox. The idea is that the "lo开发者_C百科ad next 25" comments will be selected (automatically by the macro) until all the comments are loaded on the page. It's only executing once, and returning error code -911.

Software:

iMacros for Firefox 6.6.5.0; iMacros 6.90; Firefox 3.6.3; Windows XP Pro SP3 w/all updates.