🚀 go-pugleaf

Please... somebody heeeeeeeelp.... What am I doing wrong??? 

I have an InDesign document with 9 frames on a page, all having XML-tags attached to it. After filling these frames with data I duplcate this spread and wat to remove the XML-tags from the first page... But even when using a single page and the following script, it stops with an error after item 6... 

The script:
 tell application "InDesign 2.0"
 	tell active document
 		repeat with i from 1 to the count of (every XML Element)
 			tell XML Element i
 				untag element
 			end tell
 		end repeat
 	end tell
 end tell
 

The result:
 tell application "InDesign 2.0"
 	count every XML Element of active document
 		--> 9
 	untag element XML Element 1 of active document
 	untag element XML Element 2 of active document
 	untag element XML Element 3 of active document
 	untag element XML Element 4 of active document
 	untag element XML Element 5 of active document
 	untag element XML Element 6 of active document
 		--> InDesign 2.0 got an error: XML Element 6 of active document kan niet worden opgevraagd. (can't be found???) 

What is going on, what am I doing wrong??? 

Many thanks in advance 

Ton