Why can't I end if in this AppleScript?

Question

Hello,
Could you take a look at this script and explain why I can't end the if? I have tried compiling it with out the if and everything compiles so I know it is not a Syntax Error with the rest of it. But as soon as I enter and compile the end if portion of the script I receive the Syntax Error message;
Expected end of line, etc. but found “if”.
After the error message the if directly after end is highlighted in blue. Any ideas? Here is the script;
tell app "Finder"
-- get reference to folder whose contents are shown in the window
set the target_folder to the target of the front finder window
-- make a set of folders, one for each month
set the month_titles to {"01 January", "02 February", "03 March", "04 April", "05 May", "06 June", "07 July", "08 August", "09 September", "10 October", "11 November", "12 December"}
repeat with i from 1 to 12
set the month_title to (item i of month_titles)
if not (exists folder month_title of the target_folder) then make new folder at the target_folder with properties {name:month_title}
end if
end repeat
-- find the documents in the folder
set these_files to (every document file of the target_folder)
-- move each document to its corresponding folder
repeat with i from 1 to the count of these_files
set this_file to item i of these_files
set the creation_month to (the month of (get creation date of this_file)) as string
move this_file to (the first folder of the target_folder whose name ends with the creation_month)
end repeat
end tell
Please help, and I hope you have a great day.
dofromon
these_file
set the m

Answer 1

Hello Niel,
Thank you for taking the time.That must have changed since this book was last published. Also, I apologize, I should have selected this solved my problem instead of this helped me. If you post back with the same answer I will rectify this. Thank you again and I hope you have a great day!
dofromon