lines 402 and 403 of that file say:
Code:
<?php if ($_SESSION['html_editor_preference_status']=="FCKEDITOR") {
$oFCKeditor = new FCKeditor('products_description[' . $languages[$i]['id'] . ']') ;
Thus, if you have used the pull-down menu to choose FCKEDITOR as your preferred editor within your current admin session, then this section of code will run. If you don't have the files installed for the editor, you'll naturally get the error.
If you have not selected FCKEDITOR from the pulldown, you will not get the error.
It suggests to me that you had the plugin installed, then removed it, changed things, tested, and it was not working because it was still remembering your previous selection.
Normally closing your browser, or at least logging out of the Admin should be enough to clear the preference. Clearing browser cache may assist further.
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