New problem come with javascript

php and mysql script that proven to work suddenly pop error message and entire editing process get stuck

Error message :

” Operation is not allowed when the object is closed “

line 94
char 11
code 0

file display.php

a few suspect come after :

xmlchapter.php

xmlsubchapter.php

xmlpage.php

opening those files one by one from browser guide me to the source of problem.

xmlpage.php

-
491
1747
3391

The XML page cannot be displayed

Cannot view XML input using XSL style sheet. Please correct the error and then click the Refresh button, or try again later.

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End tag ‘Itemname’ does not match the start tag ’span’. Error processing resource ‘http://localhost/cms/admin/xmlpage…Itemid>Purchasing426
“tx”>Text-indent