Problem with Applescript and iChat auto response

I am trying to set up an auto response to my iChat account. I would like to be able to send it specific commands like “current weather” and it will send me back a response with the current weather. But I am having trouble with some variables. I keep getting a “variable not defined” error.

Here is what I have



-- Get Weather
-- This is the city code. Search the code for your city on http://weather.yahoo.com/
set CityCode to 2400849
-- Temperature format
set t_format to "F"
-- Voiceover format
set v_format to "S"
-- Say present condition
set a_format to "Y"

set IURL to "http://weather.yahooapis.com/forecastrss?w=" & CityCode

-- Downloading the file using curl
set file_content to (do shell script "curl " & IURL)
-- Looking for the line with actual condition
set theText to text ((offset of "yweather:condition" in file_content) + 1) thru -1 of file_content
set sub_1 to text ((offset of "\"" in theText) + 1) thru -1 of theText

-- Today conditions found
set actual_condition to text 1 thru ((offset of "\"" in sub_1) - 1) of sub_1

-- Looking for actual temperature temperature
set sub_1a to text ((offset of "temp=" in sub_1)) thru -1 of sub_1
set sub_1b to text ((offset of "\"" in sub_1a) + 1) thru -1 of sub_1a
set actual_temp to text 1 thru ((offset of "\"" in sub_1b) - 1) of sub_1b

if t_format is equal to "C" then
	set actual_temp to (5 / 9) * (actual_temp - 32) as integer
end if

-- Looking for today forecast
set theText to text ((offset of "yweather:forecast" in file_content) + 1) thru -1 of file_content
set sub_2 to text ((offset of "\"" in theText) + 1) thru -1 of theText

-- Maximum and minimum temperatures found
set today_min_temp to word 9 of sub_2
set today_max_temp to word 12 of sub_2
if t_format is equal to "C" then
	set today_min_temp to (5 / 9) * (today_min_temp - 32) as integer
	set today_max_temp to (5 / 9) * (today_max_temp - 32) as integer
end if

-- Looking for today forecast condition (a bit tricky)
set sub_3 to text ((offset of "text" in sub_2) + 1) thru -1 of sub_2
set sub_4 to text ((offset of "\"" in sub_3) + 1) thru -1 of sub_3
set today_forecast to text 1 thru ((offset of "\"" in sub_4) - 1) of sub_4

-- Looking for tomorrow forecast
set sub_5 to text ((offset of "yweather:forecast" in sub_4) + 1) thru -1 of sub_4
set sub_6 to text ((offset of "\"" in sub_5) + 1) thru -1 of sub_5

-- Maximum and minimum temperatures found
set tomorrow_min_temp to word 9 of sub_6
set tomorrow_max_temp to word 12 of sub_6
if t_format is equal to "C" then
	set tomorrow_min_temp to (5 / 9) * (tomorrow_min_temp - 32) as integer
	set tomorrow_max_temp to (5 / 9) * (tomorrow_max_temp - 32) as integer
end if

-- Looking for tomorrow forecast condition (a bit tricky)
set sub_7 to text ((offset of "text" in sub_6) + 1) thru -1 of sub_6
set sub_8 to text ((offset of "\"" in sub_7) + 1) thru -1 of sub_7
set tomorrow_forecast to text 1 thru ((offset of "\"" in sub_8) - 1) of sub_8



using terms from application "iChat"
	on received text invitation theText from theBuddy for theChat
		accept theChat
	end received text invitation
	on message received theMessage from theBuddy for theChat
		--send "No help items are available at this time.  Please come back later when these features are included into the new version of J.A.R.V.I.S." to theBuddy
		if theMessage is "current weather" then
			send "The current weather in Everett is " to theBuddy
		else
			send "???" to theBuddy
		end if
	end message received
	
	on received audio invitation theText from theBuddy for theChat
		accept theChat
	end received audio invitation
	
	
	on received video invitation theText from theBuddy for theChat
		if (screen sharing of theChat is none) then
			accept theChat
		end if
	end received video invitation
	
	
	on received file transfer invitation theFileTransfer
		accept theFileTransfer
	end received file transfer invitation
	
	
end using terms from


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Model: 2007 Macbook Pro
AppleScript: 2.3
Browser: Safari 531.22.7
Operating System: Mac OS X (10.6)