I can't load two ckeditor at one page. FireFox

I'm trying to add two ckeditor at one page. I did it like that:

<textarea id="Articles_AnounceContent" cols="40" rows="10" name="Articles[AnounceContent]"></textarea>	

<textarea id="Articles_Content" cols="40" rows="10" name="Articles[Content]"></textarea>


<script type="text/javascript">
/*<![CDATA[*/
CKFinder.setupCKEditor(null, {'basePath':'/assets/64517f58/ckfinder/'});
CKEDITOR.replace('Articles[AnounceContent]',{'customConfig':'/custom/configAnounce.js'});
CKEDITOR.replace('Articles[Content]',{'customConfig':'/custom/configContent.js'});

</script>

But when I try to open page loaded only one of ckeditor.

And I saw error at FireBug console:

b.innerText is undefined  at ckeditor.js (line 854)

Thanks for your help.